Final answer:
Selective listening is interrupting effective communication in the given example.
Step-by-step explanation:
The listening barrier that is interrupting effective communication in the given example is selective listening. Monica is engaging in selective listening by looking at her phone and responding with minimal acknowledgment like 'Uh huh', indicating that she is not fully engaged or actively listening to Garth's weekend story. This behavior hinders effective communication as it shows a lack of interest and attention.
Learn more about Barriers to effective communication