What are the "old scars" the poet mentions in line 12? A.) Wounds from trying to escape the cage
B.) Emotional wounds left by abuse and pain
C.) A reference to slavery and scars left by oppressive masters and the practice of slavery itself
D.) Actual wounds left by the war

I know why the caged bird beats its wing
Till its blood is red on the cruel bars;
For he must fly back to his perch and cling
When he fain would be on the bough a-swing;
And a pain still throbs in the old, old scars
And they pulse again with a keener sting—
I know why he beats his wing!