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: 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: Interpersonal conflict exists whenever ____ or more people disagree.\Question: Choose the right answer from options given a) five b) seven c) no d) two

Output: d


Input: Consider Input: Cats can be litter box trained as early as ____ weeks.\Question: Choose the right answer from options given a) nine b) no c) two d) five


Output: d