Which statement is correct? Question 21Answer a. Diamonds have a large band gap and any visible wavelength photon can raise electrons to the conduction band; they are thus colourless. Graphite has a small band gap and requires UV photons to raise electrons to the conduction band; it is thus black. b. Diamonds have a small band gap and any visible wavelength photon can raise electrons to the conduction band; they are thus colourless. Graphite has a large band gap and requires UV photons to raise electrons to the conduction band; it is thus black. c. Diamonds have a large band gap and require UV photons to raise electrons to the conduction band; they are thus colourless. Graphite has a small band gap and any visible wavelength photon can raise electrons to the conduction band; it is thus black. d. Diamonds have a small band gap and require UV photons to raise electrons to the conduction band; they are thus colourless. Graphite has a large band gap and any visible wavelength photon can raise electrons to the conduction band; it is thus black