In accordance with U.S. regulations which of the following is the proper label name for a class 2.2 substance?

Correct Answer: Option D — Non-flammable gases

Pursuant to hazardous materials regulations in 49 CFR, Division 2.2 substances comprise compressed, liquefied, or dissolved gases that do not meet flammability or toxicity criteria, and are officially assigned the proper label name Non-flammable gases.