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]: All cattle have a ____ chambered stomach, consisting of a rumen, reticulum, omasum and abomasum.\Question: Choose the right answer from options given a) ten b) four c) six d) two
[EX A]: b

[EX Q]: Respiratory therapists complete two to ____ years of education.\Question: Choose the right answer from options given a) no b) one c) four d) eight
[EX A]: c

[EX Q]: Species vary in size and appearance, with the largest having a leg span of about ____ inches.\Question: Choose the right answer from options given a) four b) zero c) no d) nine
[EX A]:
d