As a boy, Frederick Douglass witnesses a scene that mortifies him and brings him face to face for the first time with the horrors of slavery. What is it ?

As a boy, Frederick Douglass witnesses a scene that mortifies him and brings him face to face for the first time with the horrors of slavery. What is it ?

A. Seeing his mother die
B. Watching a slave get beaten to death
C. Watching his aunt get whipped
D. Watching his dad beat his mother