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]: Copper is ____ times higher in dog liver than in human liver.\Question: Choose the right answer from options given a) three b) ten c) six d) one
[A]: b


[Q]: Minks travel more than most furbearers, covering up to ____ miles a night.\Question: Choose the right answer from options given a) four b) five c) zero d) ten
[A]: d


[Q]: Fresh ginseng is less than ____ years old and can be consumed in the fresh state.\Question: Choose the right answer from options given a) nine b) one c) four d) five
[A]:
c