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]: Some snails can pull over ____ times their own body-weight.\Question: Choose the right answer from options given a) nine b) six c) five d) three
[A]: d

[Q]: Granite occurs in ____ separate masses.\Question: Choose the right answer from options given a) two b) eight c) nine d) no
[A]: a

[Q]: Symmetric algorithms use secret keys shared by ____ different users.\Question: Choose the right answer from options given a) five b) two c) no d) nine
[A]:
b