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]: Healthcare providers diagnose ____ general types of insomnia.\Question: Choose the right answer from options given a) two b) eight c) one d) three
[A]: a


[Q]: Oranges signify good health, and the number ____ sounds like the word for prosperity .\Question: Choose the right answer from options given a) six b) four c) five d) eight
[A]: d


[Q]: Stars are divided into ____ spectral classes according to their color.\Question: Choose the right answer from options given a) ten b) eight c) zero d) seven
[A]:
d