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WE:Business Development (Energy and Utilities)
Re: Chris Anderson, editor of Wired magazine, has always been a
[#permalink]
08 Oct 2017, 13:09
Explanation
The second half of this sentence (after the semicolon) tells you that Chris Anderson charges money for his products, and is introduced by an ironic “interesting.”
This makes it likely that he supports the idea of information being free. Champion and proponent both imply support (detractor and critic are a pair with the opposite meaning of what you want).
Hence options champion, proponent are correct!