The Following Questions Refer to the Poster Below

The following questions refer to the poster below.

Collection of the New-York Historical Society
-Events like the one described in this headline revealed that

A) the Civil War began as a result of conflicts like this one.
B) some abolitionists were willing to use violence to bring about the end of slavery.
C) the Constitution did not protect states' rights with respect to slavery.
D) the Mexican-American war played a large role in the coming of the Civil War.