The correct answer would be, Education.
In the United States, Education is the social institution that plays the greatest role in promoting marriages within the same social class.
Explanation:
When a group of people come together for a common purpose or goal, this is called as Social Institution. The behaviors and expectations of the individuals are governed by these institutions. Family, Religion, Government, Education and Economy are five main Social Institutions.
Social class is the division of people on the basis of factors like Income, occupation, etc.
Social institution in the United States which plays greatest role in promoting marriages within the same social class is Education. Educated people emphasize on marrying people of the same social class, so that there will be no problem in adjusting with each other.
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