Today, on behalf of your fellow Americans, I offer a sincere
apology to you for the actions that unfairly denied ... families
fundamental liberties during World War II.
In passing the Civil Liberties Act of 1988, we acknowledged the
wrongs of the past and offered redress to those who endured
such grave injustice. In retrospect, we understand that the
nation's actions were rooted deeply in racial prejudice, wartime
hysteria, and a lack of political leadership.
-President Bill Clinton, letter of apology, October 1, 1993

In this excerpt, President Clinton is apologizing for –
A: the passage of the Chinese Exclusion Act
B: the verdict of the Sacco and Vanzetti trial
C: the hearings of the House Un-American Activities Committee
D: the internment of Japanese Americans