Answer:
Disconfirming communication
Explanation:
Based on the scenario being described within the question it can be said that Gabriela's comment is an example of Disconfirming communication. This term refers to when an individual's response dismisses the value of another individual. Which is what Gabriela did by making a statement that made Sebastian's happiness and self-worth decrease, since he was very happy that Nicholas had agreed to go out with him.
