The spraying of pesticides

Anurag@Gurome wrote: B is better than D because "weather conditions that cannot be foreseen" is closer to author's original intent than "weather conditions that are not foreseeable".

GmatKiss wrote:The spraying of pesticides can be carefully planned, but accidents, weather conditions that could not be foreseen, and pilot errors often cause much larger deposits of spray than they had anticipated.

(A) weather conditions that could not be foreseen, and pilot errors often cause much larger deposits of spray than they had
(B) weather conditions that cannot be foreseen, and pilot errors often cause much larger deposits of spray than
(C) unforeseeable weather conditions, and pilot errors are the cause of much larger deposits of spray than they had
(D) weather conditions that are not foreseeable , and pilot errors often cause much larger deposits of spray than.
(E) unforeseeable weather conditions, and pilot errors often cause much larger deposits of spray than they had

Anurag@Gurome wrote:

GmatKiss wrote:The spraying of pesticides can be carefully planned, but accidents, weather conditions that could not be foreseen, and pilot errors often cause much larger deposits of spray than they had anticipated.

(A) weather conditions that could not be foreseen, and pilot errors often cause much larger deposits of spray than they had
(B) weather conditions that cannot be foreseen, and pilot errors often cause much larger deposits of spray than
(C) unforeseeable weather conditions, and pilot errors are the cause of much larger deposits of spray than they had
(D) weather conditions that are not foreseeable, and pilot errors often cause much larger deposits of spray than
(E) unforeseeable weather conditions, and pilot errors often cause much larger deposits of spray than they had

"that THEY had anticipated" - THEY is a pronoun both confusing and unnecessary. So the options A, C, and E all are eliminated because of that error in the original sentence.

B is better than D because "weather conditions that cannot be foreseen" is closer to author's original intent than "weather conditions that are not foreseeable".

So B is the right answer.