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').
--------
Question: 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

Answer: b


Question: Calves can swim ____ days after they are born.\Question: Choose the right answer from options given a) ten b) two c) zero d) one

Answer: b


Question: Water exists naturally on the planet in all ____ states.\Question: Choose the right answer from options given a) three b) seven c) five d) six

Answer:
a