A solid in bulk has a band gap corresponding to the optical absorption edge of 475 nm. what will happen to the absorption edge when the solid is made as nanopar

A solid in bulk has a band gap corresponding to the optical absorption edge of 475 nm. What will happen to the absorption edge when the solid is made as nanoparticles? (a) The absorption edge will shift to longer wavelengths (b) There will be no change in the position of the absorption edge. (c)The abruption edge will disappear (d) The absorption edge will shift to shorter wavelengths.