Giampaolo promised Isabella that he would call her, but he didn't.

• A. She was happy
• B. She was surprised
• C. She was disappointed
• D. She was angry

Answer: (C)

When someone promises to do something and doesn’t follow through, the natural feeling is disappointment. Isabella expected Giampaolo to call after his promise, so not receiving the call leaves her feeling let down rather than happy, surprised, or angry. Happiness would require something good to have happened, surprise would come from something unexpected rather than a missed obligation, and anger would usually involve a sense of deliberate hurt or ongoing frustration. So the most fitting response is that she feels disappointed.