Why are people more likely to marry individuals with social and cultural backgrounds very similar to their own? a. parents and other family members always exert pressure to marry within the group. b. people spend a great deal of time alone, and therefore can have few opportunities for meeting people. c. people develop irrational fears of out-group members and are scared to date them. d. people have greater access to individuals like themselves.

It would be D, "People have greater access to individuals like themselves".

Explanation: Because people with the same culture share the same vision of life,  the same social identity,  habits and customs that includes marital matters,  and in this frame is common that people of the same group tend to chose individuals similar to their own.

In this sense, we may define culture such as the set of knowledge, ideas, traditions and customs that characterize  people or a social group.

buildings

explanation:

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.