Fact 1: The color of leaves on deciduous trees usually changes in the autumn season.

Fact 2: Autumn is a season of transistion as the warm summer days fade giving way to cooler weather.

Given the two facts above, answer the question "During what time frame do deciduous trees' leaves change color?" with the following options: 
- summer end
 - dry and hot
 - summer start
 - barrel-shaped
 - dry conditions
 - winter
 - after winter
 - climate


 

 summer end        