The correct answer is C. Environmental audit.
An environmental audit is an examination of the effects of air emission, water and soil pollution, landscape etc. It is a systematic review of an organization’s environmental management system (EMS) to determine whether it is adequate and effective in meeting environmental requirements.
A management audit is an examination of an organization’s management systems and processes to determine whether they are effective in achieving the organization’s goals.
An energy audit is an examination of an organization’s energy use to identify opportunities for energy savings.
A safety audit is an examination of an organization’s safety practices and procedures to identify potential hazards and risks.