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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
A. It is quite useful and sensible to know BigInteger. Moreover it is too late to change something when 1306 people passed the C# kata.
B. The wording is as simple as possible and understood by 19155 people. Instead of complaining propose yourself a simpler wording.
C. Maybe you are smart enough but the hint can be useful for newcomers.