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]: Chimeras are ____ headed creatures that shoot fire from all three heads, damaging a wide area.\Question: Choose the right answer from options given a) three b) one c) eight d) six
[EX A]: a

[EX Q]: Whales are divided into ____ categories, based on their teeth.\Question: Choose the right answer from options given a) two b) four c) nine d) ten
[EX A]: a

[EX Q]: Metals typically react with two, four, or ____ ligands.\Question: Choose the right answer from options given a) seven b) one c) six d) four
[EX A]:
c