Which of the following is the best explanation for why product placement can be effective at changing attitudes?  a. It tends to operate via the central route to persuasion.  b. The audience is often...

Which of the following is the best explanation for why product placement can be effective at changing attitudes?

 a. It tends to operate via the central route to persuasion.

 b. The audience is often unaware that an effort at attitude change is occurring.

 c. It usually leads to a reactance response.

d. Cognitively based efforts at persuasion tend to have longer-lasting effects.