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]: Female cats have ____ X's in each cell.\Question: Choose the right answer from options given a) five b) two c) one d) ten
[EX A]: b

[EX Q]: Evolution is dependent on ____ forces.\Question: Choose the right answer from options given a) no b) five c) two d) seven
[EX A]: c

[EX Q]: Booms are barriers that extend about ____ feet below the water surface.\Question: Choose the right answer from options given a) nine b) two c) three d) seven
[EX A]:
c