Final answer:
The correct answer is option d. passion.
Step-by-step explanation:
According to Sternberg's triangular theory of love, the type of love defined by passion and intimacy but no commitment is referred to as romantic love. Passion in this context refers to the physical attraction and sexual feelings between individuals, while intimacy relates to the closeness, connectedness, and emotional bond shared.
Romantic love is thus a combination of deep emotional and sexual feelings, characterizing relationships that have a strong physical and emotional connection, yet lack the element of long-term commitment that is part of other forms of love, like consummate love.