What are the merits of each of the specific designs?

A.

(a) A single group post-test only design is a design in which a single group of participants is given a treatment and then tested

(b) A single group pretest/posttest design is a design in which a single group of participants takes a pretest, then receives some treatment, and then takes a posttest measure

(c) A single-group time-series design is a design in which a single group of participants is measured repeatedly before and after a treatment

(d) A nonequivalent control group posttest-only design is a design in which at least two nonequivalent groups are given a treatment and then a posttest measure

(e) A nonequivalent control group pretest/posttest design is a design in which at least two nonequivalent groups are given a pretest, then a treatment, and then a posttest measure

(f) A multiple-group time-series design is a design in which a series of measures are taken on two or more groups both before and after a treatment