Final answer:
Signing the 'It Can Wait' pledge on AT&T's website is an example of a commitment, which aims to encourage distraction-free driving and align one's actions with their beliefs about road safety. The correct answer is option 3.
Step-by-step explanation:
When you visit the AT&T website and sign the 'It Can Wait' pledge to promote distraction-free driving, this action is an example of a commitment. By making a public pledge, you are committing yourself to a specific course of action, which is not engaging in dangerous behaviors like texting while driving. This commitment is intended to reinforce behavior that aligns with the pledge, thereby potentially reducing cognitive dissonance between your beliefs about safe driving and your actions.