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: Many comets have ____ tails.\Question: Choose the right answer from options given a) two b) six c) three d) one

Output: a


Input: Consider Input: Trains kill ____ people every year.\Question: Choose the right answer from options given a) zero b) three c) no d) four

Output: d


Input: Consider Input: Water is stored in tanks and comes from ____ bores.\Question: Choose the right answer from options given a) seven b) two c) eight d) three


Output: b