A matched pairs design involves:

A. matching pairs of participants based on a variable and then randomly assigning one member of each pair to each group.
B. randomly assigning participants to groups and then matching pairs of participants.
C. an attempt to control for order effects.
D. matching pairs of participants based on researcher preference and then randomly assigning half the pairs to each group.

The correct option is A. matching pairs of participants based on a variable and then randomly assigning one member of each pair to each group.

Explanation:

A matched pairs design involves matching pairs of participants based on a variable and then randomly assigning one member of each pair to each group.

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.

answer; cultural trait;