All of the Following Statements About Variability Theory Are True

All of the following statements about variability theory are true except:

A) ads placed in varying environments increase recall and improves encoding of the message.
B) variability can be obtained by modifying the product positioning strategy used within the campaign.
C) placing an advertisement in two different media would be an example of variability theory.
D) variability can be obtained by changing the situational context of an ad.