Why Do the Leaves of Deciduous Trees Change Color in the Fall

Why do the leaves of deciduous trees change color in the fall?

A) Chlorophyll is degraded, while carotenoids and other pigments are still present in the leaves.
B) The degraded chlorophyll changes into many other colors.
C) Because the water supply to the leaves has been reduced.
D) Because sugars are sent away from the leaves.
E) Because the leaves produce greater amounts of carotenoids which reflect the orange light.