Susan B. Anthony is the other reform leader W.E.B. Du Bois agreed with. The one he disagreed with was Booker T. Washington.
After he learned of it, he was not afraid that was motivated in the sense that he pushed "The World" to publish his writing. He still continued his decision and with high hopes, he wanted to change the view of the world through his findings and study in Physics.
9/11, the terrorist attack on the United States, was considered to be the spark that started the War on Terrorism.
That fact something was unfair or wrong.
The answer is B.
It was a method to produce cheap steel.