A scrub jay can remember when it cached a particular piece of food in a particular place, researchers have discovered, and tend not to bother to recover a perishable treat if stored long enough to have rotted.
tend not to bother to recover a perishable treat if
they tend not to bother recovering a perishable treat
tending not to bother to recover a perishable treat it
tends not to bother recovering a perishable treat
tends not bothering to recover a perishable treat it
so, choice (a) (as well as (c) and (e)) implies that the bird itself is "stored long enough to have rotted" -- an interesting idea, but certainly not the intended meaning of the sentence.
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