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]: Corms are undifferentiated, uniform, and contain ____ rings when cut apart.\Question: Choose the right answer from options given a) no b) three c) one d) zero
[EX A]: a

[EX Q]: Living cells have at least ____ parts.\Question: Choose the right answer from options given a) seven b) three c) zero d) four
[EX A]: b

[EX Q]: Most babies are ready to start supplemental foods at approximately ____ months of age.\Question: Choose the right answer from options given a) one b) six c) four d) three
[EX A]:
b