Which is a true statement?

brainstorming is a prewriting technique used for nonfiction writing, while freewriting is used for fiction writing.
brainstorming and freewriting are done only in group settings.
brainstorming and freewriting are both good methods for generating topic ideas.
brainstorming is used for narrowing a topic, while freewriting is used for gathering details.

According to the statements you attached, there is only one truthful:

Brainstorming is a prewriting technique used for nonfiction writing, while
freewriting is used for fiction writing. FALSE 
Brainstorming and freewriting are done only in group settings. FALSE
Brainstorming and freewriting are both good methods for generating topic ideas. TRUE
Brainstorming is used for narrowing a topic, while freewriting is used for gathering details. FALSE

That’s nice! sounds really fun.

Assembly line is the answer