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').

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

Output: a


Input: Consider Input: Lizards generally have ____ legs and movable eyelids.\Question: Choose the right answer from options given a) four b) two c) five d) zero

Output: a


Input: Consider Input: Voles are also slightly larger, usually between four to ____ inches.\Question: Choose the right answer from options given a) three b) seven c) nine d) no


Output: b