Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').

Ex Input:
Conflict diamonds account for less than ____ per cent of world trade in rough diamonds.\Question: Choose the right answer from options given a) two b) four c) one d) ten

Ex Output:
b


Ex Input:
Molecules are ____ or more atoms stuck together.\Question: Choose the right answer from options given a) two b) zero c) six d) eight

Ex Output:
a


Ex Input:
Women taking vitex for ____ months appear to have more success at becoming pregnant.\Question: Choose the right answer from options given a) four b) five c) zero d) three

Ex Output:

d