Read the paragraph from the "Ellis Island Oral History Project" excerpt.

Over the years, the project has grown to include approximately 2000 interviews. The interviews include people from dozens of countries, former Immigration and Public Health Service employees, military personnel stationed at Ellis Island and the Statue of Liberty as well as people detained at Ellis Island during World War II until it closed in 1954.

What is one central idea of the paragraph?

The interviews represent a wide range of viewpoints.
The interview project has become larger than anyone expected.
It has been difficult to get interviews from former immigrants.
Some people were allowed to give interviews when they were at work.