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: Smallmouth bass grow to ____ inches in their first growing season.\Question: Choose the right answer from options given a) five b) four c) seven d) ten
Example Output: a

Example Input: Sugar beet is strongly self-sterile setting few or ____ seeds under strict isolation.\Question: Choose the right answer from options given a) three b) no c) five d) nine
Example Output: b

Example Input: Mongooses are mostly terrestrial, moving on all ____ limbs.\Question: Choose the right answer from options given a) ten b) five c) eight d) four
Example Output:
d