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]: Nightmares happen frequently in childhood, especially between the ages of ____ and six.\Question: Choose the right answer from options given a) three b) eight c) no d) ten
[EX A]: a

[EX Q]: Reptiles also have scaly skin and a ____ chambered heart.\Question: Choose the right answer from options given a) zero b) one c) ten d) three
[EX A]: d

[EX Q]: Ladybugs have ____ ocelli, or simple eyes.\Question: Choose the right answer from options given a) nine b) zero c) seven d) two
[EX A]:
d