Robert Walton's feelings about Victor's death can best be described as disappointment and sorrow. Option D is correct.
Robert Walton is an explorer on an expedition in the Arctic in Mary Shelly's Frankenstein.
Victor Frankenstein is the doomed protagonist and narrator of the novel Frankenstein.
By the end of the story, Victor gets very sick and depressed. He longs to die, which grieves Walton. Walton is heartbroken by Victor's death.