Final answer:
The left front park light not working can be caused by a bad bulb, bad ground, or bad light socket, but not a bad switch.
Step-by-step explanation:
The left front park light not working can be caused by a variety of issues, but one of them cannot be a bad switch (option D).
The park light is generally controlled by a fuse and a relay, which are responsible for supplying power to the light. If the bulb (option A), the ground (option B), or the light socket (option C) are faulty, the light will not work properly.
However, if the switch is bad, it would affect the entire circuit, not just one specific light.