Reread the following passage from Frederick Douglass’s autobiography, looking for explicit and implicit meanings. It was a grand achievement, and I prized it highly. From that moment on, I understood the pathway from slavery to freedom. It was just what I wanted, and I got it at a time when I least expected it. While I was saddened by the thought of losing the aid of my kind mistress, I was gladdened by the invaluable instruction which, by the merest accident, I had gained from my master.
Which idea is explicitly stated in the passage?

A. Mr. Auld had scared Douglass.
B. Douglass thought Mr. Auld was wrong.
C. Mr. Auld’s decision made his wife upset.
D. Douglass learned something from Mr. Auld.