How many years did the late nelson mandela spend in prison after his sentencing in 1962?

He served 27 years

Explanation:

After the sentencing, he served 27 years in 3 different prisons: obben Island, Pollsmoor Prison, and Victor Verster Prison.

du boi was considered a radical because he wanted the immediate end for segregation. the biggest different between him and booker t. washington is that, even though washington believed that segregation should be considered illegal, he did not believe at all that a law was needed to keep blacks away from whites and that this would be something natural (to have the races apart) for a long time until society adjusted, while du boi believe that agitation was the only way to end segregation.

i would say b. or c.