Final answer:
During external radiation therapy, it is important to protect the treated area from direct sunlight to prevent skin damage and complications.
Step-by-step explanation:
The client statement that indicates a need for further instruction is c) I will expose the treated area to direct sunlight daily. During external radiation therapy, it is important to protect the treated area from direct sunlight because radiation therapy can make the skin more sensitive to sunlight. Exposing the treated area to direct sunlight can increase the risk of skin damage, burns, and other complications. It is recommended to keep the treated area covered or use sunblock with a high SPF to protect the skin from the harmful effects of the sun.