Gerund phrases are used as nouns
The sentence given is "A major Romantic poet, John Keats wrote brilliantly, loved hopelessly, and died prematurely. The answer is letter C. "and died prematurely". This is to maintain the parallel structure of the sentence which should be your guide in choosing the next phrase. "brilliantly", "hopelessly", and "prematurely" are alike.
The first thing and Then indicate a chronological structure.
3rd person because it’s told from a narrators point of view