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').

Q: Most people require roughly seven to ____ hours of sleep a night to stay alert through the day.\Question: Choose the right answer from options given a) eight b) ten c) one d) five

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

A: b
****
Q: Rainwater is the prime source of freshwater on the Island, there being ____ rivers or streams.\Question: Choose the right answer from options given a) ten b) no c) zero d) one

A:
b
****