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]: Shamrocks can be ____ of four leafs.\Question: Choose the right answer from options given a) six b) seven c) zero d) three
[EX A]: d

[EX Q]: Voles are prolific breeders and can produce four to ____ litters a year.\Question: Choose the right answer from options given a) four b) two c) six d) three
[EX A]: c

[EX Q]: Puppies being picked up can leave at ____ weeks of age.\Question: Choose the right answer from options given a) five b) two c) six d) three
[EX A]:
c