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: Wind is renewable, and produces ____ emissions or by-products.\Question: Choose the right answer from options given a) five b) nine c) zero d) no

Output: d


Input: Consider Input: Stable oxygen has eight protons and ____ neutrons.\Question: Choose the right answer from options given a) eight b) ten c) three d) zero

Output: a


Input: Consider Input: Spheres describe systems with ____ levels of equal degeneracy.\Question: Choose the right answer from options given a) three b) two c) eight d) one


Output: b