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,
b, weather conditions that cannot be foreseen, and pilot errors often cause much larger deposits of spray than

c, unforesseeable weather conditions, and pilot errors are the cause of much larger deposits of spray than they had

d, weather conditions that are not foresseeable, and pilot errors, often cause much larger deposites of spray than

e, unforeseeable weather conditions, and pilot errors often cause much larger deposits of spray than they had


b, and d is good candidates. Which is correc?