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]: Infants usually die of pneumonia or other infections before reaching ____ years of age.\Question: Choose the right answer from options given a) nine b) four c) zero d) eight
[EX A]: b

[EX Q]: Insects are arthropods that have a body with three segments, ____ legs, and one set of antennae.\Question: Choose the right answer from options given a) three b) one c) six d) zero
[EX A]: c

[EX Q]: Most infants become ready to try solid foods when they are between ____ and six months of age.\Question: Choose the right answer from options given a) six b) no c) four d) eight
[EX A]:
c