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]: Fluoroscopy has ____ magnification modes and image capture.\Question: Choose the right answer from options given a) zero b) two c) nine d) eight
[A]: b


[Q]: Elephants have four molars, which are replaced ____ times, for a total of six sets in a lifetime.\Question: Choose the right answer from options given a) five b) no c) three d) one
[A]: a


[Q]: Dogs have four molars in the upper jaw and ____ in the lower.\Question: Choose the right answer from options given a) two b) ten c) five d) six
[A]:
d