Question

what does cleaning water before we use it and after we use it require? chemicals and energy pesticides very few chemicals very little energy

Explanation:

Water treatment (before and after use) typically needs chemicals (for purification, filtration - related treatments) and energy (to run treatment processes like pumping, filtration systems). Pesticides are for pest control, not water cleaning. “Very few chemicals” or “very little energy” don't align with typical water treatment requirements as processes need sufficient chemicals/energy for effective cleaning.

Answer:

A. chemicals and energy