a. blue
Because, That object absorbs all colours light waves but does not absorbs Blue. So The blue light is reflected because it is not absorbed.
The wavelengths are corresponded to the color of the light. A blue object will reflect any light radiation expect the color blue. It will absorb the blue light. The wavelengths are corresponded to the color of the light. A blue object will reflect any light radiation expect the color blue.
HOPE THIS HELPS
