Step 1: Understand the problem.
The stated problem is that students are not attending classes in the post-pandemic period. This could be due to psychological, social, financial, or academic reasons. The solution must directly address the root cause.
Step 2: Analyze the options.
- (A) Disciplinary action: Not appropriate, as punishing students without understanding their difficulties may worsen the situation.
- (B) Counselling sessions: Appropriate, because counselling can help students overcome mental health issues, anxiety, or lack of motivation caused by the pandemic.
- (C) Surveys: Appropriate, since identifying the actual reasons for absenteeism is necessary before taking corrective action.
- (D) Course content change: Not necessarily the solution, as the problem is about attendance habits, not curriculum.
Step 3: Conclusion.
The appropriate actions are:
\[
\boxed{\text{(B) Counselling sessions and (C) Surveys}}
\]