Final answer:
The correct nursing action is to bring a portable fan into the room.
Step-by-step explanation:
The nursing action that best reflects the nurse's understanding of the therapeutic manipulation of the client's environment is option 1: Bringing a portable fan into the room. Using a fan increases the flow of air, which replaces warm air near the client's body with cooler air from elsewhere. This increases the rate of heat transfer through convection and makes the client feel cooler.