NEED HELP PLEASE!

Which statements are true about research questions? Select three choices.

A.) Secondary questions can narrow a broader topic.
B.) Secondary questions can create more meaningful insight into a topic.
C.) You must create at least three secondary research questions.
D.) A primary research question is impossible to answer.
E.) Successful research involves transforming a broad topic into a specific question.
F.) Once you have created a primary research question, you should never revise it.