Read these experts from two passages.

E-Books or Print Books? That Is the Question.
The e-book revolution is here. One online bookselling behemoth reported it sells more e-books than print books. In 2010 alone, the
sales of digital books increased by a whopping 164 percent. In 2013, the Association of American Publishers announced that e-books
accounted for 20 percent of all book sales. So, what's the story with both of these kinds of books and, ultimately, which one is better?

Click It or Brick It
When I saw my grandmother ordering gardening supplies online, it struck me that the days of brick-and-mortar shops might be
doomed. Not that my grandmother is a dinosaur, mind you. She is a wizard with the remote, uses social media to stay in touch with her
friends, and sends text messages with ease. But my grandmother's transaction made it clear: online shopping has become as
commonplace as brushing your teeth.
What is a common theme in these excerpts?

What is a common theme in these experts?
A. How the Internet has affected commerce.
B. The demise of print media.
C. The evolution of communication methods.
D. How grandparents choose to shop.