Final answer:
The highest level of commitment on the dating continuum is being engaged, which aligns with the social exchange theory where individuals aim to maximize benefits and minimize costs in relationships.
Step-by-step explanation:
On the dating continuum, the highest level of commitment is c) Engaged. In terms of social exchange theory, humans strive to maximize the benefits in relationships while minimizing the costs. Engagement signifies a high level of commitment where individuals are willing to make significant investments into the relationship, anticipating a lifelong partnership and shared future, implying a considerable increase in benefits and a willingness to take on associated costs.