According to Robert Sternberg's triangular model of love, which of the following is true of passion?

A) It is insignificant in short-term relationships.
B) It means deciding to enhance and maintain a relationship.
C) It does not involve sexual craving.
D) It involves preoccupation with the loved one.

According to Sternberg's triangular model of love, passion involves intense emotional and physical arousal, including preoccupation with the loved one, sexual desire, and excitement. Therefore, option D, which is about preoccupation with the loved one, is correct, and options A, B, and C are incorrect as they do not accurately describe passion in romantic relationships.