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').

[EX 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
[EX A]: b

[EX Q]: Most linguists organize the African languages into ____ major language families.\Question: Choose the right answer from options given a) three b) four c) eight d) no
[EX A]: b

[EX Q]: Ants have ____ stomachs.\Question: Choose the right answer from options given a) two b) nine c) four d) seven
[EX A]:
a