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]: Color codes are ____ digit combinations of letters and numbers that correspond to a specific color.\Question: Choose the right answer from options given a) six b) eight c) seven d) one
[EX A]: a

[EX Q]: Calves are born ____ and a half months after mating.\Question: Choose the right answer from options given a) six b) ten c) eight d) two
[EX A]: c

[EX Q]: Vegetative growth lasts longer with only ____ plants.\Question: Choose the right answer from options given a) four b) no c) ten d) eight
[EX A]:
a