Which of the following best describes control, a principle of experimental design?
O A. A feature of an experiment designed to isolate the variable under
observation
B. An experiment that features many groups of subjects as well as
different kinds of tests, if possible
C. The separation of experimental subjects into groups that are as
similar as possible to control the effects of lurking variables
D. The selection of experimental subjects from a large group of units
or subjects, and then randomly assigning members to treatment
and control groups using either a random number generator or a
random number table