Final answer:
The best predictor for whether a student will undergo body piercing to wear a "belly button ring" is the Elaboration Likelihood Model, which considers variables of the attitude change approach to determine when attitude change will occur.
Step-by-step explanation:
The best predictor for whether a student will undergo body piercing to wear a "belly button ring" is the Elaboration Likelihood Model. The Elaboration Likelihood Model considers the variables of the attitude change approach, such as the characteristics of the source of the persuasive message, the contents of the message, and the characteristics of the audience, to determine when attitude change will occur. It suggests that there are two main routes to delivering a persuasive message: central and peripheral.