题目求解释

The spraying of pesticides can be carefullyplanned, but accidents, weather conditions that could not be foreseen, andpilot errors often cause much larger deposits of spray than they hadanticipated.

A.   weatherconditions that could not be foreseen, and pilot errors often cause much largerdeposits of spray than they had

B.   weatherconditions that cannot be foreseen, and pilot errors often cause much largerdeposits of spray than

C.   unforeseeableweather conditions, and pilot errors are the cause of much larger deposits ofspray than they had

D.   weatherconditions that are not foreseeable, and pilot errors often cause much largerdeposits of spray than

E.    unforeseeableweather conditions, and pilot errors often cause much larger deposits of spraythan they had