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: Electrolytic capacitors have a useful life of about ____ years.\Question: Choose the right answer from options given a) ten b) eight c) zero d) seven

Answer: a


Question: All birds have ____ legs with four toes each.\Question: Choose the right answer from options given a) zero b) one c) three d) two

Answer: d


Question: Most children are under ____ years old.\Question: Choose the right answer from options given a) five b) six c) four d) three

Answer:
a