"Slang" are words that are new, flashy, and popular for only a short time
Formal language is also called "proper language" because it is the type of language you would use when first meeting someone or giving a speech at a high class place so the correct answer is:
<span>B) Have I convinced you that the study of grammar is important and well worth your effort? </span>
A.overloading the lifeboat
There are still five fish since fish can't drown.
I believe that the answer is “ they aren’t sufficiently brief” because the irony is that he’s expected to make brief summaries so since they aren’t brief then that’s irony.