In which of the following pieces does the character's visit to another world change his existing world?
A. "A Sound of Thunder"
B. "The Secret Life of Walter Mitty"
C. "Nolan Bushnell"
D. "All watched over by Machines of loving grace"
A. "A Sound of Thunder"
B. "The Secret Life of Walter Mitty"
C. "Nolan Bushnell"
D. "All watched over by Machines of loving grace"