Answer:
David Eng works for a company that only published books electronically,
Step-by-step explanation:
If Eng works for a company that only publishes electronic books, then that means his rival would be the paper book companies. Since one of the main goals of any business is to make money, Eng would want to promote his own business so consumers buy from him instead of his competitors. One way of doing this is by making your own company or product seem better, or another company or product seem inferior to your own. Since the article is about how e-readers are superior and Eng works for an electronic book company, thus would mean that his point of view is biased.