In a Between-Subjects Experiment,participants Are Assigned to Treatments Using Random

In a between-subjects experiment,participants are assigned to treatments using random assignment.Why is random assignment used?

A) It allows the experimenter to manipulate participant variables.
B) It is an attempt to control participant variables so they don't become confounding variables.
C) It gives the experimenter an opportunity to measure participant variables that might influence the outcome of the experiment.
D) It helps to ensure that the participants in the study are representative of the general population.