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').

Wolverines reproduce every ____ or three years.\Question: Choose the right answer from options given a) two b) three c) one d) four
a

Smoking is responsible for one out of ____ American deaths.\Question: Choose the right answer from options given a) five b) six c) nine d) seven
a

Fingernails have a life span of ____ to six months.\Question: Choose the right answer from options given a) ten b) three c) five d) one

b