In Chaiken and Eagly's (1983) Study in Which the Likability

In Chaiken and Eagly's (1983) study in which the likability of a speaker was varied by having the speaker praise or derogate the students, faculty, and general quality of their institution, it was found that:

A) attitude change was greatest if the students liked the speaker, no matter what medium was used
B) attitude change was greatest when students liked the speaker if written communication was used
C) attitude change was greatest when students liked the speaker if the speaker was seen or heard
D) attitude change was greatest when students liked the speaker if the speaker was seen, but not heard
E) there were no differences in attitude change across the channels