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]: Birds reach sexual maturity in three to ____ years.\Question: Choose the right answer from options given a) seven b) two c) five d) six
[EX A]: c

[EX Q]: Gigabit ethernet uses ____ wires for transmission .\Question: Choose the right answer from options given a) ten b) nine c) six d) four
[EX A]:
d