Why Is Selection of an Appropriate Design for a Non-Interventional

Why is selection of an appropriate design for a Non-interventional research study important?

A) If the design is an incorrect one, the researcher will examine variables and their interactions in a way that does not answer the research question.
B) The design involves a choice between quantitative, qualitative, outcomes, or mixed methods research.c.All designs should include data collected across time.
D) If the design is appropriate, the researcher can eliminate error.