Sentence Correction

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.
A. tend not to bother to recover a perishable treat if
B. they tend not to bother recovering a perishable treat
C. tending not to bother to recover a perishable treat it
D. tends not to bother recovering a perishable treat
E. tends not bothering to recover a perishable treat it

OA D
[spoiler]
Can someone explain the reasons for eliminating {E}[/spoiler]

The subject of the sentence is Scrub Jay, which is singular and therefore requires a singular verb form Tends. Hence, options A and B are ruled out.B also introduces pronoun error they that has no logical antecedent as subject is singular. As for option C, it introduces parallelism and tense error. (tending)

Between D and E , D maintains parallelism and therefore is more appropriate than E, which commits the same parallelism error like option C.

E is wrong for 2 reasons. i have bolded those 2 wrong structure

E says: tends not bothering to recover a perishable treat it stored long enough to have rotted.

treat it stored long enough to have rotted ---->"it" is just unnecessary
also tends not bothering is wrong