Last Fall,a State College Introduced a One-Week Study Skills Course

Last fall,a state college introduced a one-week study skills course for new freshmen students.At the end of the academic year,the college compared the grades and dropout rate for their freshmen with the corresponding measurements for freshmen at a neighboring state college.This study is an example of

A) a posttest-only nonequivalent control group design.
B) a pretest-posttest nonequivalent control group design.
C) a differential research design.
D) a time-series design.