Please answer the following question by reasoning step-by-step.
If people get upset while chatting with friends, what is the likely culprit?\nOptions:\n- misunderstanding\n- discomfort\n- love\n- learning about\n- sleeping

misunderstanding
Misunderstanding leads to people getting upset.

Misunderstanding can be a culprit.

Misunderstanding can occur while chatting with friends.

.

Therefore, the answer is misunderstanding