Which of the following is a common affiliation for an affinity card?

Affinity cards are typically associated with groups that share a common interest or bond. This could include members of professional associations, alumni groups, nonprofit organizations, or other communities. Professional associations serve as a prime example because they often create affinity cards to offer benefits to their members, such as rewards or discounts tailored to their profession.

These cards are designed to strengthen the connection between the cardholder and the organization, benefiting both parties. The card issuer usually donates a portion of the interchange fees to the affiliated organization, which can be directed toward member services or initiatives, thereby enhancing the value of being part of that association.

While other affiliations could theoretically be involved in the creation or promotion of a card, such as financial institutions, they don't represent the intrinsic community or shared benefit aspect that is characteristic of affinity cards. Thus, professional associations are the most representative choice for a common affiliation for this type of card.