In experiments,members of experimental and control groups are selected using:

A) sampling frames
B) representative samples
C) probability samples
D) randomization techniques
E) baseline community drawing

Randomization techniques are the best method for selecting members of experimental and control groups as they ensure that every member of the population has an equal chance of being assigned to either group. This helps to minimize the effect of any confounding variables and increase the internal validity of the study. Sampling frames, representative samples, probability samples, and baseline community drawing may be used to select a sample from a larger population, but they do not ensure equal group assignment.