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]: Mechanical stability comes from having fused quartz, in ____ gravity, cold.\Question: Choose the right answer from options given a) five b) zero c) six d) two
[A]: b


[Q]: Takins can even balance on their hind hooves to nibble on vegetation ____ feet above ground.\Question: Choose the right answer from options given a) two b) no c) nine d) eight
[A]: d


[Q]: Warfare exists where ____ kingdoms are in mortal conflict.\Question: Choose the right answer from options given a) two b) one c) ten d) nine
[A]:
a