Which of the Following Did the Turner Thesis Assert

Multiple Choice

Which of the following did the Turner Thesis assert?

A) The presence of the western frontier had created obstacles to the development of democracy and capitalism.
B) White Christian Americans stood at the top of civilization.
C) The financial panics of the 1870s and the 1890s were the result of the underproduction of goods.
D) Americans might require a new frontier in order to ensure the survival of the nation's democracy.
E) Blacks needed to be separated from whites in public transport.