A simple predicate can be a verb or a verb phrase. So the most likely answer to your question would be C, featured biking and skateboarding, since it is a verb phrase.
I think it’s B I’m not sure tho
The correct answer is D. Although the author discusses his opinion. The topic is not only his personal issue but it was directed at the Tory and those who write with a monotone in journalism. Chesterton also does not highlight any good characteristics about journalism. He stresses this by pointing out a small aspect of journalism which is advertisement. The author uses real life scenarios as facts to support his opinion but this does not emphasize the essay is for the public as much as D. His whole message that bad journalism belittles the capabilities of journalists and the public serves as the essay's purpose. Through the essay's purpose a reader knows it is addressed to the general public.