Question

How does the brainstorming method of freewriting help in writing a research paper?

Answer 1

C.  It allows jotting down ideas and thoughts on the research topic in a timed session.

Answer 2

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.