Why Is a Molecule That Binds to and Blocks the Action

Why is a molecule that binds to and blocks the action of ATP synthase lethal to plants?

A) ATP synthase splits water and releases oxygen;without the production of oxygen,the plants will die.
B) ATP synthase is the enzyme responsible for carbon dioxide fixation.
C) The ATP produced by ATP synthase powers the Calvin cycle,the ultimate source of all organic molecules made by the plant.
D) When ATP synthase is blocked,the electron transport chain moves electrons backwards to the reaction center.
E) If ATP synthase is blocked,chemiosmosis cannot occur,and as a result the plant will run out of water and dehydratE.