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]: Young emus are very vulnerable to disease until they are about ____ months old.\Question: Choose the right answer from options given a) no b) ten c) six d) three
[A]: d


[Q]: Mosquitoes spend one to ____ days in the pupae stage.\Question: Choose the right answer from options given a) zero b) two c) five d) three
[A]: b


[Q]: Platelets have a short life-span of just ____ days.\Question: Choose the right answer from options given a) seven b) five c) four d) one
[A]:
b