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: Neutrinos are particles with almost ____ mass and no electric charge.\Question: Choose the right answer from options given a) no b) two c) zero d) five

Output: a


Input: Consider Input: Earthworms have ____ pairs of hearts.\Question: Choose the right answer from options given a) seven b) five c) one d) no

Output: b


Input: Consider Input: Unplugged shotguns allow hunters an ammunition capacity of greater than ____ shells.\Question: Choose the right answer from options given a) zero b) nine c) three d) two


Output: c