With no explanation, chose the best option from "A" or "B". Mr. Nelson is an English teacher who has trouble being patient and is teaching a rowdy group of students. Mr. Nelson wants the students to behave.

A: Mr. Nelson switches to an activity-based teaching style to channel his students' energy and engage them.
B: Mr. Nelson loses his temper and loudly tells the students to be quiet, lamenting how undisciplined they are.
A.