The doctrine of delectus personae/personarum refers to the right of a person to choose:

The doctrine of delectus personae/personarum specifically highlights the principle that partners in a partnership have the inherent right to choose whom they wish to associate with in that business relationship. This doctrine acknowledges that the identity of the partners is crucial to the partnership; thus, individuals may have preferences regarding who they will enter into a legal and operational partnership with.

This choice is particularly significant because partnerships are often built on trust, shared values, and mutual goals, making the selection of partners a vital component for the partnership's success. The law recognizes that an individual may not want to partner with just anyone but rather those they believe they can work effectively alongside.

While the notion of engaging in a business is an important aspect of partnership, the specific focus of delectus personae/personarum is exclusively on the personal selection of partners rather than the general nature of the business or activities they may pursue together. This clarification supports the understanding of the correct answer, which centers on the personal choice of partners within a partnership.