Mr Bumble Is Lecturing on the Importance of Lab Equipment

Mr. Bumble is lecturing on the importance of lab equipment safety when he notices two girls passing a note. Rather then unobtrusively taking the note, he calls the whole class's attention to the matter. And even after the girls are shamefully embarrassed, he goes into a diatribe about the value of education, and how most students squander away their high school years. Mr. Bumble is notorious for this behavior. Which error does Mr. Bumble make in respect to students' academic learning time?

A) Maintaining activity flow
B) Minimizing transition time
C) Holding students accountable
D) Showing he is in charge