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: Mothers typically have from one to ____ cubs, which are born blind and toothless.\Question: Choose the right answer from options given a) six b) zero c) four d) seven
Example Output: a

Example Input: People can go without food for up to about ____ weeks.\Question: Choose the right answer from options given a) three b) one c) nine d) four
Example Output: a

Example Input: Females give birth to a single baby after a gestation period of about ____ months.\Question: Choose the right answer from options given a) seven b) two c) six d) three
Example Output:
c