The correct answer is D.
If the principal of your institution is not satisfied with your performance and charge you with the act of negligence of duties, the best way to behave with him is to keep yourself alert and make his efforts unfruitful. This means that you should try to improve your performance and meet the expectations of the principal. You should also try to understand the reasons why the principal is not satisfied with your performance and try to address those issues. If you are able to do this, you will be able to maintain a good relationship with the principal and continue to be successful in your studies.
Option A is not the best option because it is not constructive. Taking revenge on the principal will only make the situation worse.
Option B is also not the best option because it is not helpful. Neglecting the principal will not solve the problem.
Option C is not the best option because it is not productive. Taking a tough stand against the changes will only make the principal more determined to see you fail.
Therefore, the best option is to keep yourself alert and make his efforts unfruitful.