Final answer:
The item that is the exception and may not result in radiographic images that are too light is high milliamperage (mA) setting.
Step-by-step explanation:
The item that is the exception and may not result in radiographic images that are too light is d) High milliamperage (mA) setting. Underexposure, insufficient processing time, and incorrect screen-film combination can all result in radiographic images that are too light. Underexposure occurs when the X-ray machine does not produce enough radiation to properly expose the film. Insufficient processing time can lead to inadequate development of the image, resulting in a lighter appearance. Finally, using an incorrect screen-film combination can also affect the overall brightness of the image.