What is a good reason not to use a "rubber duck" antenna inside your car?

Using a "rubber duck" antenna inside your car can result in significantly weaker signals compared to using an external antenna. This occurs because the metal components of the vehicle, such as the roof and other parts, can interfere with the signal. These components can absorb, reflect, or block radio waves, leading to diminished performance. The design of a rubber duck antenna, which is a compact, omnidirectional antenna, is not optimized for use inside a vehicle where obstacles can attenuate the signal.

While there may be other concerns regarding overheating or SWR adjustments, the primary and most relevant issue is the loss of signal strength when the antenna is positioned inside the car. This makes Option A the most accurate reason for avoiding the use of a rubber duck antenna in that context.