Answer:
Option C, Which fixture uses the most water in our home? Eliminate
Step-by-step explanation:
The overall agenda of Jonathan's experiment is to conduct an experiment through which he will try to identify the fixture which causing the maximum water loss and then this fixture will be replaced with an efficient fixture to reduce water wastage.
Thus, once the agenda is clear, the most appropriate question among the given options would be option (C) Which fixture uses the most water in our home? Eliminate