Which action would increase the external costs of operating a car? 

A)  fixing the car's brakes 
B)  disconnecting the car's air pollution control system 
C)  tuning the car's motor 
D)  listening to the car's radio

External Costs

Costs that are not borne by the parties involved in an economic transaction but are imposed on others outside of the transaction.

Air Pollution Control System

Technologies and measures designed to reduce or eliminate the emission of pollutants into the atmosphere.

Operating a Car

The act of controlling and managing the functions and movement of a motor vehicle.