Gordon Is Unable to Conduct His Own Studies of Patients

Gordon is unable to conduct his own studies of patients with psychological disorders because of a lack of research funds. Even so, he is able to publish an important paper on the effectiveness of a particular treatment for schizophrenia by using meta-analysis; this procedure is both convenient and powerful because it __________.

A) allows the results of many different studies to be combined
B) allows for a finer, more detailed statistical study
C) is much simpler than most other statistical methods
D) is more likely to produce the expected results than other methods