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The correct answer is D. They mapped trails and helped build forts

Explanation

Mountain men are a group of people who lived in the western mountains of the United States. These mountains were characterized by being difficult to access, so there were no roads in this area, and it did not have many human settlements. Once the idea of building and connecting the entire country was planted, the help of men who inhabited this area was needed to trace the roads and build them because they knew how to move and work on that terrain due to their extensive experience in that terrain. Therefore, the correct answer is D. They mapped trails and helped build forts

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.