500
Read the text:
Do you like to read? Do you ever wonder how the letters end up on a page? What was reading like for people before we knew how to print books and type? Who was responsible for creating a way to put printed type on a page?
In 1440, a man named Johannes Gutenberg began using the printing press in the Rhine Valley. He used blocks, each carved with a single letter on its face. The press used by Gutenberg was a hand press. He rolled ink over the raised surfaces of these blocks, which were held within a wooden form. Then the form was pressed against a sheet of paper.
This invention spread across Europe. Because the press created books and written documents more quickly than hand-copying had, people became much better able to explore ideas, pass along culture, express political opinions, and educate one another through books. Since then, we have made enormous strides in printing. Books and typed pages are readily available. Imagine what life would be like if we had only hand-copied versions of books! The printing press made putting type on a page much faster and easier than it had ever been before. Thanks to Johannes Gutenberg, you can read as much as you like!
Which detail supports the main idea of the passage?
a. The invention spread across Europe.
b. Then the form was pressed against a sheet of paper.
c. People can educate each other through books.
d. Books and typed pages are readily available.