The answers are A and C.
A. David's garage, the most cluttered room in the house. The phrase <em>the</em> <em>most cluttered room in the house</em> is an appositive because it presents <em>information about the noun garage.</em>
C. Joey's brother, Adam, threw a tantrum... The proper noun <em>Adam</em> is an appositive because i<em>t gives extra information about the noun brother.</em>
The Geats passed by the guard at the shore. He called out a greeting to them as they loaded their treasure aboard the ship. Beowulf gave a jeweled sword to the man who guarded the boat. This gift earned the man much respect in the beer hall.
Ted Kerasote introduces the setting in the first paragraph of his essay. He describes the scene to the reader, that the action is taking place in the Northeastern corner of Yellowstone Park in the hills above Soda Bottle Creek. He describes that it's an isolated area, if you left one road you would not come across another one for quite some time.
Yet it was never enough for her.