The answer would be option B "Johnny." Johnny died in the hospital because of the fire. It was from the burning down church and Pony, and Johnny went in their to save many little kids. It's not option A because Two-bit doesn't die at all, it's not option C because Ponyboy doesn't die either, it's also not option D because Dallas died in a gun fight with the police.
Hope this helps!
Because he wants to show he is knowledgeable and trustworthy
The purpose that the historical anecdotes serve in these two literary pieces of art is that they serve as attention-grabbing hooks. They need to get you interested and involved in the story.