To reuse water, we can follow various methods. Among the given options, the method C: "Washing machine drain water to clean the toilet" is the most suitable method to reuse water. Here is a detailed explanation:
Method C: Washing machine drain water to clean the toilet
- When the washing machine drains water after completing a cycle, the water can be collected and reused for other purposes.
- One such purpose is to use this water for cleaning the toilet. The water from the washing machine is usually clean and can be used for non-potable purposes like toilet flushing.
- Reusing washing machine water to clean the toilet helps to conserve water and reduce water wastage.
Other options:
Although the other options mentioned (A, B, and D) involve collecting and reusing water, they may not be as practical or effective as option C. Here is a brief explanation for each option:
- Option A: Collecting rainwater to clean vegetables
- While collecting rainwater is an eco-friendly practice, using it specifically for cleaning vegetables may not be necessary.
- It is generally recommended to wash vegetables with clean, potable water to ensure food safety.
- Option B: Collecting water from a leaking tap to cook
- Collecting water from a leaking tap is a temporary solution to prevent water wastage, but it may not be suitable for cooking purposes.
- The quality of water from a leaking tap may be compromised, and using it for cooking may affect the taste and safety of the food.
- Option D: Using washing machine water to water plants
- Reusing washing machine water to water plants is another eco-friendly practice, but it may not be suitable for all types of plants.
- The detergent and chemicals present in the washing machine water can potentially harm certain plants and affect their growth.
Conclusion:
Among the given options, reusing washing machine drain water to clean the toilet is the most practical and effective method to reuse water. It helps in conserving water and minimizing water wastage.

Understanding Water Reuse Methods
Water reuse is an important practice for conserving our water resources. Among the options provided, option 'C' is the most effective method for reusing water.
Explanation of Option C: Washing Machine Drain Water to Clean the Toilet
Using water from the washing machine to clean the toilet is a practical and efficient way to recycle water. Here’s why this method stands out:
- Source of Water: The water that comes from washing clothes is often only soiled with detergent, dirt, and small particles. It can be safely used for flushing toilets, where cleanliness standards are less stringent compared to drinking water.
- Environmental Impact: This method significantly reduces the amount of fresh water required for toilet flushing, which is one of the largest domestic water uses in many households. By reusing this water, we help in conserving valuable freshwater resources.
- Cost-Effective: Using washing machine drain water for toilets can lower water bills, especially in areas where water costs are high. This makes it an economical choice for households.
Why Other Options Are Less Effective
- Option A (Collect Rain Water to Clean Vegetables): While collecting rainwater is a great idea, it's not directly related to reusing water that has already been used.
- Option B (Collect Water from Leaking Tap to Cook): This practice is not reliable as the water may be contaminated and is not safe for cooking.
- Option D (Washing Machine Water to Water Plants): Although this is a possible method, it may not always be ideal due to the presence of detergents that could harm plants.
Conclusion
In summary, option 'C' is the best choice for reusing water, promoting sustainability while ensuring hygiene in household practices.