Opportunity cost is what must be in order to
something else.

Opportunity cost forces consumers and producers to make

Opportunity cost is what must be  given up in order to  gain something else.

Opportunity cost forces consumers and producers to make  choices.

Explanation:

intimacy, passion and commitment are the components of a interpersonal relationship emphasized in the triangular theory of love by robert sternberg.

the triangular theory of love says love can be comprehend as this componest form the vertices of a triangle.  

intimacy relates to feelings such as of closeness and connection;

passion relates the drives that brings people together, as physical attraction.

commitment relates to the being in a long-term relationship.