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: Mechanical stability comes from having fused quartz, in ____ gravity, cold.\Question: Choose the right answer from options given a) five b) zero c) six d) two

Output: b


Input: Consider Input: Wolverines reproduce every ____ or three years.\Question: Choose the right answer from options given a) two b) three c) one d) four

Output: a


Input: Consider Input: Most lizards have eyelids, ear openings, ____ legs and a tail.\Question: Choose the right answer from options given a) five b) eight c) four d) one


Output: c