Define the Conditions of Random Sampling

Define the conditions of random sampling.

A) Participants are sorted randomly and placed in either an experimental group or a control group.
B) Participants are selected without knowing what the experimental variable is in the study.
C) Participants are selected to represent the general population and are randomly placed in either the experimental or control group.
D) Participants are selected to represent the population being studied and have an equal chance of being placed in the experimental as in the control group.