What Is the Difference Between Experimental and Quasi-Experimental Research

What is the difference between experimental and quasi-experimental research?

A) In an experimental study, participants are randomly assigned to conditions, whereas they are not assigned randomly in a quasi-experimental study.
B) In a quasi-experimental study, participants are randomly assigned to conditions, whereas they are not assigned randomly in an experimental study.
C) There is no difference between them.
D) A quasi-experimental study uses a repeated measures design, whereas an experimental study uses an independent measures design design.