That if you are speaking to someone through message or email or any written message it has no tone. You may say something with good intentions & someone may take it the wrong way.
Answer is: the big chungus
Brainstorming is thinking of idea's and organizing them into subtopics.
This can help organize the research paper so that you know what you're ready to write about. Without the brainstorming method, you'll wander into other topics and might forget what you think is crucial to inform the readers about.
Let's cut the chit chat, and formalities. I'm not one for greetings or unnecessary niceties.
The answer is A.
Why?
Because a run-on consists of two or more independent clauses that are not separated by a colon or semicolon.
This is evident in Choice A