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]: Altimetric satellites are usually limited life missions lasting approximately three to ____ years.\Question: Choose the right answer from options given a) five b) ten c) four d) eight
[A]: b


[Q]: Adult tarantulas require a minimum of ____ to five crickets a week.\Question: Choose the right answer from options given a) seven b) three c) four d) five
[A]: b


[Q]: Doxycycline antibiotics twice a day for ____ days is also effective.\Question: Choose the right answer from options given a) eight b) five c) nine d) zero
[A]:
b