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]: Vaporization can occur in temperatures as low as ____ degrees.\Question: Choose the right answer from options given a) one b) zero c) eight d) two
[A]: b

[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
[A]: c

[Q]: Scientists think that macaws mate for life, producing one to ____ young each year.\Question: Choose the right answer from options given a) three b) eight c) five d) nine
[A]:
a