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]: Cleavage occurs typically in either one, two, three, four, or ____ directions.\Question: Choose the right answer from options given a) six b) three c) ten d) two
[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]: Water is the only substance on earth found naturally in ____ forms - solid, liquid, and gas.\Question: Choose the right answer from options given a) five b) zero c) two d) three
[EX A]:
d