Read the following passage from Frederick Douglass’s autobiography, looking for explicit and implicit meanings. Just at this point of my progress, Mr Auld found out what was going on, and at once forbade Mrs Auld to instruct me further, telling her, among other things, that it was unlawful, as well as unsafe, to teach a slave to read.
Which idea is explicitly stated in the passage?
A. Preventing the instruction was a punishment.
B. Mrs. Auld was doing something illegal.
C. Frederick was already getting too smart.
D. Mr. Auld was upset with the instruction.