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]: 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
[EX A]: b

[EX Q]: Most ovarian cysts go away on their own in ____ to three months without causing any problems.\Question: Choose the right answer from options given a) one b) ten c) five d) eight
[EX A]: a

[EX Q]: Bacteria acquire genes for resistance in ____ ways.\Question: Choose the right answer from options given a) three b) six c) five d) nine
[EX A]:
a