1- The correct answer is C.
This is a visual imagery. The author is describing the drowning of young Icarus, his legs the last visible part of his body as he sinks into the water.
2- The correct answer is D.
The tone of this poem is gloomy. Here, the author shows his disappointment with the human race and how indiffirent we can be to other people's suffering.
3- The correct answer is C.
The main theme is that, no matter the tragedies that may occur, it is not the end of the world, and people have to continue living their lives.
4- The correct answer is D.
This is the sentence that best reflects the theme because, even though the people of the ship have seen Icarus fall into the water and drown, they simply continued sailing, paying no real attention to the tragedy.