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: Circles mark the approximate locations of ____ recently discovered solar systems.\Question: Choose the right answer from options given a) four b) no c) zero d) nine

Output: a


Input: Consider Input: Normal cells have ____ copies of each chromosome.\Question: Choose the right answer from options given a) two b) five c) eight d) no

Output: a


Input: Consider Input: National surveys show that every ____ seconds a woman is physically abused.\Question: Choose the right answer from options given a) five b) seven c) nine d) one


Output: c