In which of the following pieces does the character's visit to another world change his existing world? (1 point) Responses "A Sound of Thunder" "A Sound of Thunder" "The Secret Life of Walter Mitty" "The Secret Life of Walter Mitty" "Nolan Bushnell" "Nolan Bushnell" "All Watched Over by Machines of Loving Grace"

"A Sound of Thunder," a short story by Ray Bradbury, is the most fitting answer among the options given. In this story, characters visit another world—or more accurately, another time—through time travel. Their visit to the prehistoric past changes their existing world due to the butterfly effect: even a small action like stepping on a butterfly during the time of the dinosaurs can have dramatic consequences on the future. When the characters return to their own time, they find subtle but significant changes that illustrate how their interaction with the past has altered their present reality.

"The Secret Life of Walter Mitty," a short story by James Thurber, is about a man who escapes his mundane life through vivid daydreams of grandeur and adventure. While these daydreams provide an emotional and psychological escape, they don't have any direct impact on the physical state of his existing world; hence the story does not fit the asked criteria.

"Nolan Bushnell" likely refers to the entrepreneur known for founding Atari, inc. and Chuck E. Cheese's Pizza Time Theatre, rather than a piece of fiction. As such, it does not pertain to characters visiting another world with consequential changes to their own.

Finally, "All Watched Over by Machines of Loving Grace" is a poem by Richard Brautigan that imagines a utopian world in which people live in harmony with nature, guided and cared for by benevolent computers. This poem does not involve characters visiting another world that changes their existing one in the same narrative mechanism that "A Sound of Thunder" employs.