The so-called "investment model" is a model that seeks to explain why people stay with their long-term relationship partners. This model identifies three key factors, namely a. passion, commitment, and intimacy. b. security, anxiety, and avoidance. c. satisfaction, alternatives, and investments. d. similarity, familiarity, and propinquity.

C - Satisfaction, alternatives and investments

Explanation:

In psychology studies, factors keeping couples together long term even when the benefits aren't as many were discovered as the investment model.

The three factors identified are:

Satisfaction: When levels of satisfaction are high and there are fewer arguments or distasteful occurrences in a relationship, couples tend to stay committed in a relationship. Alternatives: When a couple weighs the odds of getting someone else to satisfy their needs and there is nobody but their partner capable of doing that, they stay committed in that relationship Investments: Include resources like assets acquired together or money, children, efforts, connections, memories gotten over the course of the relationship that could be lost with ending the relationship.