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]: Carbon forms ____ bonds.\Question: Choose the right answer from options given a) five b) four c) two d) three
[A]: b


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


[Q]: Coral is a heterogeneous cluster built in ____ phases.\Question: Choose the right answer from options given a) nine b) six c) three d) two
[A]:
c