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]: Cats have ____ sets of vocal cords.\Question: Choose the right answer from options given a) zero b) nine c) two d) three
[EX A]: c

[EX Q]: Government is divided into ____ basic functions.\Question: Choose the right answer from options given a) three b) no c) two d) four
[EX A]: c

[EX Q]: Sulphite oxidase is a homodimer, each monomer consisting of ____ structural domains.\Question: Choose the right answer from options given a) two b) seven c) three d) five
[EX A]:
c