Which would reflect the most radiant energy based on its color?

The correct answer would be white color or light color objects.

The color of an object indicates the light wavelength that is being reflected. For example, chlorophyll appears green as they reflect the green wavelength of the light.

In addition, white light consists of all the wavelengths of the visible spectrum.

Thus, if an object appears white that means it is capable of reflecting all the wavelengths of the visible spectrum.

Hence, white becomes the most reflective color.