The correct answer is D. Romantic
Step-by-step explanation:
Relationships between individuals and love are classified into different types, this includes infatuation in which there is passion but no intimacy or commitment; empty love in which there is commitment but no passion or intimacy; liking in which there is only intimacy; and romantic love in the case there is only passion and intimacy but no commitment. Romantic love is the one shown by Diane and Bruce because they show passion and intimacy as they are attracted to each other and share intimate emotions and thoughts, but they do not have any commitment.