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: Chlorine has ____ naturally occurring isotopes.\Question: Choose the right answer from options given a) nine b) eight c) three d) two

Output: d

Input: Consider Input: Vampires generally are male, and rabies is ____ times more frequent in men than in women.\Question: Choose the right answer from options given a) no b) two c) zero d) seven

Output: d

Input: Consider Input: Maps have ____ or more bar scales, each in a different unit of measure.\Question: Choose the right answer from options given a) no b) four c) three d) ten
Output: c