The correct answer is C. 01 month.
Accident drills are important to ensure that employees are prepared for real-world accidents. They help to identify potential hazards, and to develop and practice procedures for responding to accidents. Accident drills should be conducted on a regular basis, at least once a month. This will help to ensure that employees are always up-to-date on the latest procedures, and that they are comfortable responding to accidents in a safe and efficient manner.
Option A is incorrect because it is too long. Accident drills should be conducted on a regular basis, but not so often that they become disruptive to the workplace.
Option B is incorrect because it is too short. Accident drills should be conducted on a regular basis, but not so infrequently that employees forget the procedures.
Option D is incorrect because it is not a valid option.