Which sentence includes a detail that reveals the technology of the setting?
A. The baby in it, but it held up through the mile-long walk.
B. When the boys awoke and stumbled out of the cave, they saw what they had not noticed the night before: they were only a few feet from the trail.
C. Jacques was my brother, and I was his sister—no matter what happened on the trip, we would take care of each other.
D. As we walked deeper into the forest, the symphony of bird and animal calls grew louder, as if the volume knob were slowly being turned.