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: 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

Output: c


Input: Consider Input: Calves remain hidden for much of the time, and are weaned by ____ months of age.\Question: Choose the right answer from options given a) six b) three c) eight d) one

Output: b


Input: Consider Input: Geologists now think the Earth is about ____ and a half billion years old.\Question: Choose the right answer from options given a) three b) nine c) ten d) four


Output: d