A nurse is educating a client who has emphysema about the use of home-prescribed oxygen therapy. Which of the following statements by the client indicates understanding of the teaching?

Rationale: A. Petroleum-based products (such as petroleum jelly) are flammable and should not be used near oxygen therapy due to increased fire risk. Water-based lubricants are safer for dryness. B. Cotton blankets are safe to use with oxygen therapy because cotton is a natural fiber that does not easily generate static electricity or pose a significant fire hazard. This statement reflects appropriate understanding of oxygen safety precautions. C. Nail polish and its fumes are flammable, and using or storing such products near oxygen equipment increases the risk of fire. Oxygen supports combustion, making flammable substances especially dangerous. D. Smoking is strictly prohibited in any environment where oxygen is in use or stored, as oxygen greatly increases the risk of rapid ignition and severe fire hazards. This is a critical safety teaching point for all clients on home oxygen therapy.