C. Police officers and Firefighters are required to train at special academies before they are ready to work in the field. These academies are specialized training courses to test their mental and physical level of knowledge and how they would perform on job. Trainings like this are used to also see how they rank against others that are wanting the same job as them to see if they compare and can handle it.
The answer is C.
Police officers and Firefighters
Police Officers and Firefighters
But specific answer D if on multiple choice homework.