A．That Negroes were docile was denied by the slaveholders.
B．That Negroes were docile Was not quite true.
C．That Negroes were docile was a lie fostered by their masters.
D．That Negroes were docile was sheer nonsense.

A．inevitable phenomenon of social developing
B．few people are aware of it
C．the tax exerted on manufacturer is too heavy
D．difficulty in affixing legal responsibility on the people who caused the problem