Question

White light is shining on a green grape. The grape _____.

Answer 1

White light is shining on a green grape. The grape "reflects green light"

In short, Your Answer would be Option B

Hope this helps!

Answer 2

The grape absorbs all colors except green, and green light is the 
only light that remains to bounce around and enter people's eyes.  

This is a big part of the reason why, whenever somebody looks at 
the grape, they remark "Oh look !  The grape is green !"