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]: Some motors contain ____ gears and spin very fast, and have little if any torque.\Question: Choose the right answer from options given a) four b) three c) five d) no
[EX A]: d

[EX Q]: Double price is based on two golfers sharing ____ room.\Question: Choose the right answer from options given a) one b) zero c) six d) nine
[EX A]: a

[EX Q]: Scientists can even create oysters with ____ sets of chromosomes, instead of the normal two.\Question: Choose the right answer from options given a) four b) three c) nine d) ten
[EX A]:
b