The correct answer is D) Avoiding giving stimulants. When a person has been overcome by gas fumes, giving stimulants like alcohol or caffeine should be avoided. Stimulants can increase the person's heart rate and respiration, which could further strain their already compromised respiratory system. Instead, the proper first aid steps are to promptly remove the patient from the hazardous atmosphere (B), keep them warm and comfortable (A), and apply artificial respiration and massage if needed (C). Stimulants could do more harm than good in this situation and should be avoided.