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: Calves are completely nutritionally dependent on their mothers to ____ months old.\Question: Choose the right answer from options given a) three b) zero c) five d) no
Example Output: a

Example Input: Reality is more than what can be perceived with the ____ senses.\Question: Choose the right answer from options given a) five b) four c) ten d) one
Example Output: a

Example Input: Many nations now spend ____ times as much on debt repayment as on health care.\Question: Choose the right answer from options given a) eight b) no c) four d) nine
Example Output:
c