What Best Describes Freakonomics Author Stephen Dubner's Experience with Convergence

What best describes Freakonomics author Stephen Dubner's experience with convergence?

A) He was exclusively a print journalist but had to learn broadcasting after leaving the New York Times.
B) Some of his work is in electronic media, but he relies on others to handle the production of this work.
C) He has worked across media platforms since college.
D) He only works in radio and newspapers, not the web or social media.