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: Echinoderms usually have ____ appendages, but there are some exceptions.\Question: Choose the right answer from options given a) ten b) five c) seven d) three

Output: b


Input: Consider Input: Bacteria come in ____ basic shapes.\Question: Choose the right answer from options given a) five b) one c) three d) nine

Output: c


Input: Consider Input: Calves stay close to their mothers for ____ years.\Question: Choose the right answer from options given a) two b) no c) eight d) five


Output: a


