The only difference between a posttest-only control-group design and the posttest-only with nonequivalent groups is: a.            The former has a control group. b.            The latter lacks random...

The only difference between a posttest-only control-group design and the posttest-only with nonequivalent groups is:

a.            The former has a control group.

b.            The latter lacks random assignment.

c.             Only one group receives training in the former.

d.            The control group is carefully selected in the former.

e.            All the above