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: Conflict occurs between when ____ people have a car accident.\Question: Choose the right answer from options given a) no b) eight c) two d) nine

Output: c


Input: Consider Input: Cyclic neutropenia tends to occur every three weeks and last ____ to six days at a time.\Question: Choose the right answer from options given a) six b) four c) five d) three

Output: d


Input: Consider Input: Nitrogen atoms have ____ valence electrons.\Question: Choose the right answer from options given a) five b) four c) three d) ten


Output: a