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: Evolution is dependent on ____ forces.\Question: Choose the right answer from options given a) no b) five c) two d) seven

Output: c


Input: Consider Input: Earwigs produce ____ or two generations every year.\Question: Choose the right answer from options given a) two b) no c) one d) nine

Output: c


Input: Consider Input: Cinnabar exists in ____ crystal forms.\Question: Choose the right answer from options given a) two b) six c) zero d) one


Output: a