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:
Mothers usually give birth to one, two, or ____ babies at a time.\Question: Choose the right answer from options given a) three b) zero c) five d) ten

Ex Output:
a

Ex Input:
Cooked meat freezes well for up to ____ months.\Question: Choose the right answer from options given a) four b) three c) eight d) five

Ex Output:
b

Ex Input:
Synthetic waxes can last ____ to nine months or longer and typically wipe on and off easily.\Question: Choose the right answer from options given a) one b) six c) two d) eight

Ex Output:
b