Final answer:
B: An individual can practice a combination of styles during the course of a single relationship, as styles of loving can change and evolve according to the triangular theory of love proposed by Sternberg.
Step-by-step explanation:
According to the theories proposed by psychologists such as Robert Sternberg, an individual's style of loving can change. Sternberg's triangular theory of love states that a healthy relationship includes three components: intimacy, passion, and commitment. These components may be present in different forms and combinations in relationships. Therefore, the correct answer to this question is B: An individual can practice a combination of styles during the course of a single relationship. It is common for people to experience and express different types of love throughout their relationships, and these expressions can evolve as circumstances or the relationship dynamics change.