Answer: D) The imagery underscores Mr. Shiftlet's restlessness and his reluctance to remain in one place.
Step-by-step explanation: In the given excerpt from "The life you save may be your own", Mr. Shiftlet compares his body to a house (because he couldn't move) and his spirit to an automobile, which is always moving, this demonstrates the wisdom and intelligence of Mr. Shiftlet and also emphasizes in the fact that despite his condition, he refuses to remain in one place.