Answer:
Avoid prejudging the speaker.
Step-by-step explanation:
Jack failed to uphold the guideline for ethical listening to avoid prejudging the speaker. Listening is a very important aspect of social interaction. It is very valuable when we have to acquire knowledge from teachers. Being attentive is crucial. To avoid prejudging the speaker it is key to listen to what the speaker is saying. When Jack thinks that because of the teacher's accent he is not going to learn anything he is failing in a guideline for ethical listening.