Read this excerpt from “Educate Yourself” by Marcus Garvey. As stated before, books are one's best companions. Try to get them and keep them. A method of doing so is every time you have ten cents or twenty five cents or a dollar to spend foolishly[,] either on your friends or yourself[,] think how much more useful that ten or twenty five cents or dollar would be invested in a book and so invest it. It may be just the thing you have been looking for to give you a thought by which you may win the heart of the world. The ten cent, twenty five cent or a dollar, therefore, may turn out to be an investment of worth to the extent of a million dollars. Never lend anybody the book that you want. You will never get it back. Never allow anybody to go to your bookshelf in your absence because the very book that you may want most may be taken from the shelf and you may never be able to get one of the kind again.

Which sentence paraphrases the central idea of this excerpt?

A book may be worth a million dollars.
Never lend anyone a valuable book.
Books are a treasure to be valued.
Keep books on a special bookshelf.