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 recovering a perishable treat if
D.tends not to bother recovering a perishable treat
E.tends not bothering to recover a perishable treat if 为啥选D呢?不明白讲什么意思?