One Way to Reduce the Effectiveness of Product Placement as a Method

One way to reduce the effectiveness of product placement as a method of persuasion is

A) to ensure that the products are already popular.
B) to show so many products that people will be too overwhelmed to change their attitudes.
C) to ensure that products are only placed in the periphery of the scene so they are less noticeable.
D) to warn people that an attempt at persuasion is coming.
E) to ensure that the products are part of the central action of the scene so that people are aware that this is an attempt to persuade them.