Final answer:
Demonstrating supportive behavior by acknowledging a friend's disappointment over being passed over for a promotion, instead of dismissing their feelings, highlights the behavior of empathy.
Step-by-step explanation:
If your friend tells you that he's been passed over for a promotion, saying, "I can see why you would be disappointed when you've worked so hard," rather than "It's not that big a deal," illustrates the supportive behavior of empathy. Empathy involves understanding and sharing the feelings of another person. In contrast, sympathy would involve feeling pity for someone else's misfortune, but not necessarily sharing their feelings. Envy would entail desiring what others have, and indifference would be a lack of concern or interest in the situation. Therefore, the correct answer from the options provided is empathy.