Zombie cars are best described as autonomous vehicles that drive without passengers and may cause pollution if not powered cleanly.

• A. They drive without passengers.
• B. They carry passengers only.
• C. They are exclusively electric.
• D. They operate in a closed system.

Answer: (A)

The main idea here is the behavior that defines zombie cars: they drive without passengers. The statement describes them as autonomous vehicles that operate without anyone riding in them, so the correct choice directly matches that defining trait. The other options introduce ideas not specified in the description: carrying passengers would contradict the “without passengers” part; being exclusively electric isn’t stated—and the pollution concern doesn’t imply an electric-only power source; and nothing in the description mentions a closed system, so that claim isn’t grounded either.