With all other factors held constant, which of the following milliamperage (mA) settings will result in the greatest number of x-rays produced?

The setting for milliamperage (mA) directly influences the quantity of x-rays generated during the radiographic imaging process. When the mA is increased, the current flowing through the x-ray tube also increases, resulting in a greater number of electrons being produced at the cathode. These electrons are then accelerated toward the anode, where they interact to produce x-rays.

In this instance, the highest milliamperage option provided is 400 mA. Choosing this setting will generate the greatest number of x-rays because there is a larger flow of electrons available to interact at the target. This increased interaction leads to a more intense radiation output, which translates to a higher quantity of x-rays being produced.

Thus, with all other factors kept constant, the option of 400 mA is the optimal choice for maximizing x-ray production during imaging procedures.