What is the central idea of section 2?

Responses

A Presidential libraries have books written by past presidents.Presidential libraries have books written by past presidents.

B Presidential libraries were built to encourage historical research.Presidential libraries were built to encourage historical research.

C Presidential libraries differ from other libraries and are similar to museums.Presidential libraries differ from other libraries and are similar to museums.

D Presidential libraries were built to encourage the public to learn about past presidents.Presidential libraries were built to encourage the public to learn about past presidents.

D Presidential libraries were built to encourage the public to learn about past presidents.

The central idea of section 2 is D: Presidential libraries were built to encourage the public to learn about past presidents.