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').

[EX Q]: Mares abort suddenly without signs of illness, and the fetus shows ____ signs of degenerative change.\Question: Choose the right answer from options given a) zero b) no c) seven d) ten
[EX A]: b

[EX Q]: Ocular dryness responds to the use of artificial tears applied every ____ to three hours.\Question: Choose the right answer from options given a) no b) one c) three d) eight
[EX A]: b

[EX Q]: Light emanates ____ major rays that have varying wavelengths.\Question: Choose the right answer from options given a) seven b) ten c) three d) nine
[EX A]:
a