Explanation:

Introduction:
Red worms, also known as compost worms or Eisenia fetida, are commonly used in composting and vermicomposting. They play a crucial role in breaking down organic waste materials and converting them into nutrient-rich compost. Creating a comfortable home for red worms is essential to ensure their health and optimal composting activity.

Options:
a) Dig a pit about 30 cm deep.
b) Dig a pit about 30 cm deep at a place which is very hot.
c) Dig a pit about 30 cm deep at a place which is very cold.
d) Dig a pit 30 cm deep at a place which is neither too hot nor too cold.

Explanation of the correct answer - Option D:
To create a comfortable home for red worms, it is important to provide them with suitable temperature conditions. Extreme temperatures, whether hot or cold, can be detrimental to their well-being. Therefore, the correct answer is option D, which suggests digging a pit 30 cm deep at a place which is neither too hot nor too cold.

Reasoning:
1. Red worms are sensitive to temperature fluctuations and thrive in moderate temperatures between 15-25 degrees Celsius.
2. If the pit is dug in a place that is very hot, the high temperatures can cause the worms to dry out and die. Excessive heat can also accelerate the decomposition process, making it difficult for the worms to keep up with the rate of decomposition.
3. On the other hand, if the pit is dug in a place that is very cold, the low temperatures can slow down the worms' metabolic activity, leading to decreased feeding and reproduction. In extreme cold conditions, the worms may even go into a state of dormancy or die.
4. Digging a pit about 30 cm deep at a place which is neither too hot nor too cold provides a stable and moderate environment for the red worms. This depth helps to provide insulation against temperature fluctuations from the surrounding environment.
5. Additionally, maintaining the pit at ground level or slightly elevated helps to prevent waterlogging, which can be harmful to the worms.

Conclusion:
Creating a comfortable home for red worms involves considering their temperature requirements. Option D, which suggests digging a pit 30 cm deep at a place which is neither too hot nor too cold, provides the best environment for the worms to thrive and carry out their composting activities effectively.

They neither live in hot nor in cold