One of the primary advantages of a pretest–posttest nonequivalent control group design, in comparison to other nonequivalent group designs, is a. the posttest scores can help reduce threats from...

One of the primary advantages of a pretest–posttest nonequivalent control group design, in comparison to other nonequivalent group designs, is

a. the posttest scores can help reduce threats from history effects.

b. the pretest scores can help reduce the threat of assignment bias.

c. the posttest scores can help reduce the threat of differential history.

d. the pretest scores can help reduce the threat of differential history.