please. Ten war relocation centers were built in remote deserts, plains, and swamps of seven states; Arkansas, Arizona, California, Colorado, Idaho, Utah, and Wyoming. Manzanar, located in the Owens Valley of California between the Sierra Nevada on the west and the Inyo mountains on the east, was typical in many ways of the 10 camps.

Which best identifies the main idea of this passage?

A) The relocation centers were all modeled after Manzanar.

B) The relocation centers were hastily built.

C) The relocation centers were all fairly small.

D) The relocation centers were crowded.