The answer your'e looking for is C. informal, hope this helped!
A. Is the answer to what I think your speech should be about.
The answer to your question is A
The importance is that Saul didn’t do his purpose of what he was supposed to do.
The answer is B because "I have visited many cities including the following" indicates that there is going to be a list of cities. A colon is used to introduce a series of items or to separate two independent clauses; however the second sentence has to add on to the first.
