In Order to Measure Whether a Message Produced an Attitude

Multiple Choice

In order to measure whether a message produced an attitude change when an after-only design was used,you should compare the attitudes of the people who received the message with

A) their attitudes toward similar issues.
B) their attitudes toward the same issue at least two weeks ago.
C) the attitudes of people who received the message two weeks after the first group.
D) the attitudes of people who did not receive the message.