Answer:
C. Running the washing machine only when it is full
Step-by-step explanation:
C is the answer because washing in bulk conserves water while washing in bits does not conserve water
For instance, if you decide to wash your clothes everyday, it will waste water but if you wash your clothes once or twice in a week, it conserves water
A is not the answer because, the action will just waste electricity
B is also not the answer because, taking baths instead of quick showers waste water and does not conserve it
D is not the answer because turning off fans when leaving the house conserves electricity not water