During photosynthesis

a. light reactions produce sugar, while the calvin cycle produces o2.
b. light reactions produce nadph and atp, while the calvin cycle produces sugar.
c. light reactions photophosphorylate adp, while the calvin cycle produces atp.
d. the calvin cycle produces both sugar and o2.

B

Explanation:

The first stage of photosynthesis is the light reaction which occur in the thylakoid membrane of the chloroplast. Solar energy of light captured by chlorophylls, and is used to produce high-energy electrons of which in a series of reactions produces ATP and NADPH.

In the dark reaction of photosynthesis the ATP and NADPH are used to reduce CO2 to produce sugar