Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure.
Which of the following best explains how the words testing and endure contribute to the meaning of the speech?
A. They imply that the war may change the country in unexpected ways.
B. They stress the patriotic responsibility of every audience member.
C. They remind the audience of the sacrifices Union soldiers made.
D. They assert that this is a critical, life-or-death moment for the country.