A teacher who is not able to draw the attention of his students should

A teacher who cannot draw students' attention should evaluate his teaching method and improve it.

Resigning from the post (B) is an over-reaction that abandons professional growth.

Finding fault in pupils (C) shifts blame instead of addressing the real cause.

Starting to dictate (D) is a poor, one-way method that worsens disengagement.

Self-appraisal and reflective practice are the professional response to weak classroom response.

Reflective teaching, described by Donald Schon, treats such feedback as a basis for improvement.