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]: 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]: Corn borers complete at least ____ generations each summer.\Question: Choose the right answer from options given a) zero b) three c) two d) ten
[EX A]: c

[EX Q]: Rhinos are ungulates, or herbivorous animals with ____ toes.\Question: Choose the right answer from options given a) nine b) four c) three d) six
[EX A]:
c