(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
Solution:
Pronoun
In A, C, and E, they (at the end) doesnt have an antecedent. They is supposed to refer to pilots but "pilot errors" is the subject here and not pilots.
In D, foreseeable, being an adjective, cannot be used as the object of a sentence.
In B, weather conditions that cannot be foreseen rectifies the error in D.
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