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: Insects are arthropods that have a body with three segments, ____ legs, and one set of antennae.\Question: Choose the right answer from options given a) three b) one c) six d) zero
Example Output: c

Example Input: Peonies grow from two to ____ feet in height.\Question: Choose the right answer from options given a) five b) zero c) three d) four
Example Output: d

Example Input: Most people require roughly ____ to eight hours of sleep a night to stay alert through the day.\Question: Choose the right answer from options given a) six b) seven c) ten d) nine
Example Output:
b