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]: Most gerbils live three to ____ years and have few health problems.\Question: Choose the right answer from options given a) three b) four c) seven d) zero
[A]: b


[Q]: Pandas reach adulthood at about ____ years of age.\Question: Choose the right answer from options given a) eight b) seven c) five d) six
[A]: c


[Q]: Cofactors are divides into ____ categories, one being coenzymes.\Question: Choose the right answer from options given a) eight b) five c) two d) nine
[A]:
c