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]: Some infected horses show ____ signs and become chronic carriers of the disease.\Question: Choose the right answer from options given a) nine b) six c) four d) no
[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]: Quads are basically motorcycles with ____ wheels.\Question: Choose the right answer from options given a) three b) ten c) four d) eight
[A]:
c