Which of the Following Generalizations Drawn from Persuasion Research Is

Which of the following generalizations drawn from persuasion research is most accurate?

A) Current studies, from the 1970s through the 1990s, tend to contradict past studies, those from the 1940s through the 60s
B) The results of persuasion studies have been remarkably consistent, dating back to the time of Aristotle
C) Newly developed statistical techniques have made it possible to resolve a number of previous inconsistencies in the literature
D) Research findings are largely consistent, but there are dramatic differences in theories of persuasion