Which one of the following organizations tests electrical equipment for compliance with accepted standards?
a. the national fire prevention association
b. underwriters' laboratories, inc.
c. the national electrical manufacturers association
d. certified ballast manufacturers

B. Underwriters' Laboratories, Inc.

Explanation:

The Underwriters' Laboratories, Inc. conducts all kinds of security certifications, including electrical equipment, that's why you see the circular  UL Certified logo on every electrical device sold in the US, including all electronic devices.

The National Fire Prevention Association develops standards for electricity installations in the workplace, the National Electric Code (for buildings) and other similar.

The National Electrical Manufacturers Association sets norms for the generation and transportation of energy, for the power providers.

Certified Ballast Manufacturers is just an association of electric ballast makers.