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]: Millipedes have ____ pairs of legs on each body segment.\Question: Choose the right answer from options given a) seven b) ten c) six d) two
[A]: d


[Q]: Bloody diarrhea lasts for two to ____ days.\Question: Choose the right answer from options given a) nine b) five c) three d) no
[A]: b


[Q]: Black contours correspond to ____ displacement.\Question: Choose the right answer from options given a) two b) three c) zero d) seven
[A]:
c