Which user group is primarily targeted by the nonprofit trade association's online sales?

The correct choice focuses on the user group that a nonprofit trade association primarily aims to serve through its online sales. Nonprofit trade associations typically cater to a niche audience that includes professionals from industries aligned with their mission. Therefore, universities and companies play a significant role in this context as they often seek resources, training, and networking opportunities offered by trade associations. These organizations may purchase memberships, publications, or training materials that help enhance their operations or compliance to industry standards.

On the other hand, individuals, government agencies, and nonprofits, while they may also benefit from the association’s offerings, are generally not the main audience for online sales. The products and services sold tend to be more relevant to businesses and academic institutions that require specialized support or resources, illustrating why universities and companies are the primary focus of the trade association's sales efforts.