Which example is biodegradable? 

A)  Something that can be broken down by autotrophs. 
B)  Something that cannot be broken down by any living processes. 
C)  Something that can be broken down by heterotrophs. 
D)  Something that can be broken down by decomposers.

Biodegradable items can be broken down by decomposers, such as bacteria and fungi. Therefore, option D is the correct answer. Choice A only mentions autotrophs, which are not decomposers, and choice B states that the item cannot be broken down at all, which is not biodegradable. Choice C mentions heterotrophs, which include decomposers, but does not explicitly state that the item can be broken down.