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').

[Q]: Poles CAN occur at ____ frequency.\Question: Choose the right answer from options given a) six b) four c) zero d) eight
[A]: c


[Q]: Traditional neon electrifies the inert gas from ____ directions.\Question: Choose the right answer from options given a) two b) nine c) one d) six
[A]: a


[Q]: Bridge is a partnership game requiring ____ players.\Question: Choose the right answer from options given a) two b) no c) seven d) four
[A]:
d