Why Do the Light Reactions Have Both Cyclic and Noncyclic

Multiple Choice

Why do the light reactions have both cyclic and noncyclic electron pathways?

A) to ensure that ATP and NAPDH are generated in a 1:1 molar ratio
B) because only the combination of pathways can generate sufficient NADPH for the light-independent reactions
C) to provide more electrons from water than would be released by the noncyclic pathway
D) because the light-independent reactions require ATP and NADPH in different amounts than are generated by noncyclic electron flow