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]: Color codes are ____ digit combinations of letters and numbers that correspond to a specific color.\Question: Choose the right answer from options given a) six b) eight c) seven d) one
[EX A]: a

[EX Q]: Human rabies is extremely rare, and there have been no cases in Oregon in the last ____ years.\Question: Choose the right answer from options given a) nine b) five c) ten d) eight
[EX A]: d

[EX Q]: Cartilage is also slippery five to ____ times more slippery than ice.\Question: Choose the right answer from options given a) eight b) ten c) nine d) five
[EX A]:
a