What Part of the Light Reactions Starts Off Photosynthesis

Question

What part of the light reactions starts off photosynthesis?
A)Electron Transport Chain
B)Photosystem I
C)Calvin Cycle
D)Photosystem II
E)ATP Synthesis

Accepted Answer

The light reactions begin with the noncyclic electron pathway,which involves first photosystem II,and then photosystem I.The Calvin cycle is not part of the light reactions.