In 2007, computer scientist NAME_1 was working on converting printed books into a digital format. He found that some words were distorted enough that digital scanners couldn’t recognize them, but most humans could easily read them. Based on that finding, NAME_2 invented a simple security test to keep automated “bots” out of websites. The first version of the reCAPTCHA test asked users to type one known word and one of the many words scanners couldn’t recognize. Correct answers proved the users were humans and added data to the book-digitizing project.
Which choice best states the main purpose of the text?
A)  To discuss NAME_2’s invention of reCAPTCHA 
B)  To explain how digital scanners work 
C)  To call attention to NAME_2’s book-digitizing project 
D)  To indicate how popular reCAPTCHA is 