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').

Example Input: Shamrocks can be ____ of four leafs.\Question: Choose the right answer from options given a) six b) seven c) zero d) three
Example Output: d

Example Input: Most women notice their breasts become fuller and firmer within the first six to ____ weeks.\Question: Choose the right answer from options given a) four b) eight c) zero d) ten
Example Output: b

Example Input: Victorian workers have their wages regulated through ____ parallel systems.\Question: Choose the right answer from options given a) ten b) zero c) two d) nine
Example Output:
c