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: Human females have ____ X chromosomes.\Question: Choose the right answer from options given a) two b) six c) one d) eight

Answer: a


Question: Clover leaves with ____ to nine leaflets, illustrating a tendency to mutate.\Question: Choose the right answer from options given a) three b) zero c) ten d) five

Answer: a


Question: Babies can lose heat rapidly, as much as ____ times more quickly than adults.\Question: Choose the right answer from options given a) four b) nine c) three d) two

Answer:
a