The color of leaves on deciduous trees usually changes in the autumn season.
Autumn is a season of transistion as the warm summer days fade giving way to cooler weather.
Deciduous trees have leaves that change color when summer fades.
During what time frame do deciduous trees' leaves change color?

a) summer end
b) dry and hot
c) summer start
d) barrel-shaped
e) dry conditions
f) winter
g) after winter
h) climate