Caleb and Greg Both Want to Improve Their Social Confidence

Caleb and Greg both want to improve their social confidence. Caleb buys a popular CD containing subliminal messages. The CD manufacturers claim that if Caleb listens to the music on the CD every day, his mind will perceive the subliminal messages and his confidence will improve. Greg purchases a book on social confidence. The book includes exercises intended to make him more aware of how his thoughts and behaviors affect his social confidence. Who will see results?

A) Caleb only
B) Greg only
C) Both Caleb and Greg may get results, but Greg's will probably be better.
D) Both Caleb and Greg may get results, but Caleb's will probably be better.