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]: Female cats come into heat cycles every ____ to four weeks during certain times of the year.\Question: Choose the right answer from options given a) eight b) ten c) zero d) three
[EX A]: d

[EX Q]: Respect is for every species in the world, including all ____ races.\Question: Choose the right answer from options given a) four b) ten c) five d) zero
[EX A]:
a