As a tree goes into dormancy, its leaves change color. What causes this change in color?

The tree makes extra chlorophyll.

The tree stops making chlorophyll.

The tree produces extra hormones.

The tree stops producing hormones.

The tree stops making chlorophyll

The tree stops making chlorophyll.

The leaves begin to stop making food due to the changing cold temperatures in the fall. This leads them to stop making the necessary chlorophyll needed in leaves. The absence of the chlorophyll gives the leaves their color.