According to Oakes, why did Douglass oppose the ten percent plan?

a) With this plan the federal government expected the former slaves to subject themselves to the political authority of the former masters.

b) Southern blacks remained slaves until they compensated masters for their total market value.

c) The plan forced Northern blacks to pay a special tax that would be redistributed among former slave owners to compensate them for their lose of property.

d) Both B and C