The best answer is D because it has incorrect grammar, and uses slang/jargon and a dialect known as ebonics that was typically present in black communities during this time.
Answer:
You could get two 'complete' sentences without the connection.
I guess I like your teacher for the Sonic reference.
The first-level text should be “Types of Tornadoes”
The second-level text should be “Watersprouts”
The third-level text should be “Form Over Water”
It would be C. Informal because you are suppose to start business letters with Dear (Yourname) and it's the only one that does.