Which of the following organizations is accredited to certify gas appliances, equipment, and accessories?

The correct response identifies organizations that have the proper authority and established standards to certify gas appliances, equipment, and accessories. Specifically, the Canadian Gas Association (CGA), Underwriters Laboratories of Canada (ULC), Canadian Standards Association (CSA), and Technical Standards and Safety Authority (TSSA) are recognized for their expertise in this field.

These organizations are involved in developing codes and standards that ensure safety and compliance for gas-related products. Their accreditation processes involve rigorous testing and evaluation procedures that confirm whether a product meets specific safety requirements and performance benchmarks. This ensures that consumers and industry professionals can rely on the equipment's safety and efficacy.

In contrast, the other listed organizations either don't focus on gas equipment certification or have different scopes of expertise. For instance, FM Global specializes in property insurance and loss prevention, ISO develops international standards across a range of industries, and ASTM focuses primarily on standards for materials and products across various sectors, none of which are specifically aimed at gas appliance certification.