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').

Q: 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

A: a
****
Q: Smallmouth bass grow to ____ inches in their first growing season.\Question: Choose the right answer from options given a) five b) four c) seven d) ten

A: a
****
Q: Most dark colorations begin to lighten after ____ weeks of treatment.\Question: Choose the right answer from options given a) five b) four c) seven d) one

A:
b
****