Sentence Correction

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

The answer is B, I'd like to know why D is not correct?
I'm not quite sure about the difference between "can not be foreseen" and "are not foreseeable"

i'm confused with it too....

juliette 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

The answer is B, I'd like to know why D is not correct?
I'm not quite sure about the difference between "can not be foreseen" and "are not foreseeable"

My pick is B. The choice B is more appropriate here. IMO If you use that are not foreseeable instead of that cannot be foreseen, it will change the context of the original sentence.