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: Some skulls show the marks of up to ____ bullets.\Question: Choose the right answer from options given a) five b) three c) eight d) six
Example Output: d

Example Input: Teething begins for most babies around ____ to six months.\Question: Choose the right answer from options given a) three b) four c) five d) seven
Example Output: b

Example Input: Women can have only one baby each ____ months, plus recovery time.\Question: Choose the right answer from options given a) ten b) six c) nine d) three
Example Output:
c