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: Huntsman spiders have large, hairy bodies with ____ long legs.\Question: Choose the right answer from options given a) three b) eight c) ten d) six
Example Output: b

Example Input: National immunization vaccinates all children under ____ against polio.\Question: Choose the right answer from options given a) zero b) four c) ten d) five
Example Output: b

Example Input: Cows normally expel the placenta within ____ to eight hours.\Question: Choose the right answer from options given a) seven b) zero c) two d) no
Example Output:
c