Local cultures are sustained through customs. A custom is a practice that a group of people routinely follows. People have customs regarding all parts of their lives from eating and drinking to dancing and sports. To sustain a local culture the people must retain their customs. The customs change in small ways over time but they are maintained despite the onslaught of popular culture.

7. The changes in local culture brought about by the onslaught of popular culture tend to disrupt ___________________.
A. Population
B. Economics
C. Transport Connections
D. Religious Beliefs
E. Customs
Is it E?

That is what your paragraph says.

Yes, you are correct. The changes in local culture brought about by the onslaught of popular culture tend to disrupt customs (option E). The passage states that customs are the practices that a group of people routinely follows and that sustaining local cultures requires retaining these customs. While customs may change in small ways over time, they are still maintained despite the influence of popular culture.