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').

Dispassion is a ____ edged sword.\Question: Choose the right answer from options given a) six b) two c) zero d) four
b

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
b

Ions can consist of ____ or more atoms.\Question: Choose the right answer from options given a) three b) eight c) two d) one

c