The correct answer is metres for measuring length generally we use metre. it is the standerd form of length

Understanding Length Measurement
Length is a fundamental dimension that helps us understand the size or distance of an object. It is measured in specific units, and the most commonly used unit for measuring length is the meter (m).
Units of Measurement
- Grams (g): Grams are used to measure mass, not length. They indicate how heavy an object is.
- Liters (L): Liters measure volume, which refers to the amount of space that a substance (liquid or gas) occupies.
- Meters (m): Meters are the standard unit of length in the International System of Units (SI). They are used to measure distances, heights, widths, and other linear dimensions. For example, the length of a room or the height of a person can be measured in meters.
- Kilograms (kg): Kilograms are another unit for measuring mass, which is how heavy an object is. They are not related to length measurements.
Why Meters?
- The meter is widely used in various fields, including science, engineering, and everyday life, making it a universal unit for measuring length.
- Other units of length can include centimeters (cm) and kilometers (km), but these are all based on the meter. For instance, 100 centimeters make up one meter, and 1,000 meters make up one kilometer.
Conclusion
In conclusion, when measuring length, the correct unit to use is the meter (m), making option 'C' the right answer. Understanding these measurements is essential for everyday activities, from cooking to building.