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.
All of these could influence a person’s perspective.
The answer is D. unwilling