Which of the Following Statements Is True About Quantitative and Qualitative

Which of the following statements is true about quantitative and qualitative methods?

A) Qualitative research can sometimes pave the way for quantitative studies on the same subject.
B) Quantitative research generally should come before qualitative studies on the same subject.
C) Qualitative studies need to be followed by quantitative studies before the results can be sufficient.
D) Quantitative studies need to be followed by qualitative studies before the results can be sufficient.