How Does Correlational Research Differ from Descriptive Research

How does correlational research differ from descriptive research?

A) Descriptive research takes place in non-laboratory settings whereas correlational research is laboratory based.
B) Descriptive research always involves observation whereas correlational research always involves questionnaires or surveys.
C) In correlational research, an attempt is made to describe relationships between variables while no such attempt is made in descriptive research.
D) Correlational research involves random assignment to different conditions while descriptive research involves only one group.