Answer
To stop the Holocaust the United states and other countries could have passed laws that made anti-Semitic illegal.
Explanation
Holocaust was genocide which was carried against Jews and other groups. Millions of people including homosexuals, Jehovah witnesses, soviet prisoners of war and political dissidents also suffered mostly oppression and death under Nazi tyranny.
Antisemitism was the discrimination against the Jews. To prevent this before the war the nations could have passed the anti-Semitic law and make it illegal so as to protect the Jews and other ethnic groups from being hated and discriminated
The correct answer is Crispus Attucks
Attucks is considered as the first person to have been killed in the Boston massacre and in consequence the first American killed in the American Revolution. During the Boston Massacre British soldiers fired on a mob of colonists in Boston
I would have to say its D but not that sure thou