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]: Toenails are similar , except that they grow ____ times slower and are on the toes .\Question: Choose the right answer from options given a) two b) eight c) six d) four
[A]: d


[Q]: Routers are basically systems, which connect ____ networks together.\Question: Choose the right answer from options given a) three b) two c) nine d) six
[A]: b


[Q]: Natural neodymium is a mixture of ____ stable isotopes.\Question: Choose the right answer from options given a) no b) six c) seven d) five
[A]:
c