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]: Pneumatic motor is a six-point unit with ____ pneumatics facing up and three facing down.\Question: Choose the right answer from options given a) five b) no c) three d) nine
[EX A]: c

[EX Q]: Human females have ____ X chromosomes.\Question: Choose the right answer from options given a) two b) six c) one d) eight
[EX A]: a

[EX Q]: Whooping cranes are ____ feet tall and grayish white.\Question: Choose the right answer from options given a) no b) five c) ten d) eight
[EX A]:
b