C. Sigmund Freud is the answer
The first-aider will be ready with a first aid kit and will be on guard in case of accidents or injuries. First aid means, the first action done on someone who is injured or not feeling well within the designated place. He/she must know some first aid treatments or methods, such as treating a cut or bruise, giving artificial ventilation and CPR, etc.
Answer:
the active and passive voice has been explained by the teacher three times (2nd answer)
Explanation: