If a mutation occurs such that photosystem ii no longer functions as efficiently as it should, what might be most directly affected?

Out of the following given choices;

a)The amount of oxygen produced

b)The rate of ATP synthesis by ATP synthase in the chloroplast

c)The rate at which NADPH is produced

d)The rate at which the protons are transported into the thylakoid

The answer is; A

The photosystem captures energy from sunlight and uses it to split a water molecule.   After splitting the water molecule (by taking an electron), the protein complex transports the electron to plastoquinone. The splitting of water molecules results in evolving of oxygen molecules. The hydrogen is what is used to reduce carbon dioxide to glucose.