You are sent on a "welfare check" because a family reports that they have not seen or heard from their elderly father for two days. You find a disheveled, semi-conscious elderly man sitting in a chair in his den. You are immediately aware of a foul odor in the house. After scene safety is assured, which of the following is the most important next step?
A) Perform a rapid physical exam to determine possible injuries.
B) Look around the room to assess his living conditions.
C) Call the family to tell them he is alive but ill.
D) Call for law enforcement to assist in searching the house.