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').
--------
Question: Most spiders have ____ eyes and eight legs.\Question: Choose the right answer from options given a) eight b) five c) no d) three

Answer: a


Question: Elephants have four molars, which are replaced ____ times, for a total of six sets in a lifetime.\Question: Choose the right answer from options given a) five b) no c) three d) one

Answer: a


Question: Arthritis is the leading cause of disability in the state affecting about one in ____ adults.\Question: Choose the right answer from options given a) two b) three c) ten d) one

Answer:
b