What happens to a colored object when it is covered by a color filter of a different color?

When a colored object is covered by a color filter of a different color, it can appear black if the filter does not allow any of the primary colors that are reflected by the object to pass through. Color filters work by absorbing certain wavelengths of light while allowing others to pass through. For example, if you have a red object and you place a blue filter over it, the filter will absorb red wavelengths (the ones reflected by the red object) and only let blue wavelengths through. Since the red object can't reflect any blue light, it won’t be visible and will appear black through the blue filter.

This principle applies generally: when the color of the filter absorbs all the wavelengths that the object reflects, the result is that the object appears black. Hence, the correct answer reflects this concept effectively.