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: Lions have ____ distinct vocalizations including roars, grunts and growls.\Question: Choose the right answer from options given a) eight b) six c) four d) nine

Output: d


Input: Consider Input: Nodes are points in space that have ____ probability for locating an electron there.\Question: Choose the right answer from options given a) no b) six c) zero d) three

Output: c


Input: Consider Input: Christians believe in one god in ____ persons.\Question: Choose the right answer from options given a) three b) no c) four d) one


Output: a