A herd of deer lives in a forest where they eat the leaves of trees. The number of energy storage molecules in the trees and in the deer has increased. What has happened to the amount of carbon in the trees and in the deer?

The amount of carbon in the trees and in the deer . . .

a
has increased.
has increased.

b
has decreased.
has decreased.

c
has not changed.
has not changed.

d
is not related to the number of energy storage molecules.