What Is the Key Advantage of Joining an On-Going Research

What is the key advantage of joining an on-going research project instead of starting your own?

A) One of the hardest task of conducting research as an amateur is selecting the research question.
B) You don't have enough experience in analysis and joining an on-going project will allow others to help you with that.
C) On-going research projects give you immersion faster and allow you to participate in the most important part of research: answering the question.
D) On-going projects already have a design, and designing how to conduct a study takes a lot of time and energy.