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]: Litters contain from one to ____ kittens, and tend to be much larger when prey is abundant.\Question: Choose the right answer from options given a) three b) four c) two d) seven
[EX A]: b

[EX Q]: Kabbalists group the simple letters into ____ triplets.\Question: Choose the right answer from options given a) four b) no c) ten d) three
[EX A]: a

[EX Q]: Leaves normally take up to ____ years to decay.\Question: Choose the right answer from options given a) no b) two c) ten d) four
[EX A]:
b