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]: Vaccination typically occurs at ____ to eight weeks of age in kittens.\Question: Choose the right answer from options given a) three b) nine c) six d) no
[EX A]: c

[EX Q]: Streptomyces are of special interest for ____ reasons.\Question: Choose the right answer from options given a) nine b) seven c) four d) two
[EX A]: d

[EX Q]: Antipsychotic drugs can take between ____ and three months to take effect.\Question: Choose the right answer from options given a) three b) one c) zero d) no
[EX A]:
b