Read this excerpt from Chapter 7, The Narrative of the Life of Frederick Douglass and answer the question. In this way I got a good many lessons in writing, which it is quite possible I should never have gotten in any other way. During this time, my copy-book was the board fence, brick wall, and pavement; my pen and ink was a lump of chalk. With these, I learned mainly to write.

Which of the following is/are contextual clues that helped you determine the implicit meaning(s) above? Select all that apply.

The “lump of chalk” was used in school.
Saying “I learned mainly to write.”
Schools used fences, bricks, and pavement.
Comparisons of school items with his poor substitutes.