Theory is defined as collection of believes persisted by a human or society that might have been or not examined yet. It behaves as the guiding principles and explanation obtained from researcher and studying .It can provide information of the relation,concept and analysis of the belief.
According to the question, Benjamin is studying and analyzing the concept of marriage .He understands that belief that marriage can work is trust and relying that a person can be good partner.Thus, he is depicting theory which has certain principle.It is also widely accepted by people.
