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.
I believe the correct answer is B. With the reading of the written stage directions.
It isn't enough to just change the tone or the volume of the characters' voices, as this excerpt has a lot of important "silent" things happening. The stage directions are not mere instructions as to what the actors should do, but also a kind of an interpretation of their actions. That is why it is important that the listener hears those details as well.