Answer:
1. B, he realized other people saw him as different from them because of his race.
2. C, He later wrote that slavery actually helped African Americans by teaching them to more be self-reliant than the whites they served.
Step-by-step explanation:
1. When one of his cards was refused by another student, it was Duboi's first realization that he was not accepted by everyone.
2. Washington's perspective on slavery was unique and controversial, especially compared to writers like W.E.B DuBois, who viewed slavery as devastating to african american culture.