Ryan Wanted to Study the Effect of Adult Play with Preschoolers

Multiple Choice

Ryan wanted to study the effect of adult play with preschoolers on the children's noisiness.So,he went to one preschool for a week and played with the children during breaks.At the end of the week,he measured their noisiness.For comparison purposes,he found another preschool across town and measured their noisiness as well to see the effect of playing with the children.Which design does this example reflect?

A) one-shot case study
B) classical
C) one-group pretest-posttest
D) static-group comparison
E) Solomon 4-group design