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]: Birds have ____ eyes.\Question: Choose the right answer from options given a) eight b) five c) nine d) two
[EX A]: d

[EX Q]: Fats come in ____ different forms saturated and unsaturated.\Question: Choose the right answer from options given a) no b) two c) six d) seven
[EX A]: b

[EX Q]: Most candles take about ____ hours to cool completely, depending on their size.\Question: Choose the right answer from options given a) two b) no c) eight d) six
[EX A]:
d