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 bacteria have one or ____ circular chromosomes.\Question: Choose the right answer from options given a) ten b) eight c) six d) two
[EX A]: d

[EX Q]: Shamrocks can be ____ of four leafs.\Question: Choose the right answer from options given a) six b) seven c) zero d) three
[EX A]: d

[EX Q]: Male rats reach sexual maturity at ____ months, females at four months.\Question: Choose the right answer from options given a) three b) one c) two d) six
[EX A]:
a