3. Why a modern transmission electron microscope (TEM) can achieve a resolution of about 0.2 nanometers, whereas a standard light microscope has a maximum resolution of about 200 nanometers? (A) Glass lenses in light microscopes refract light, which reduces resolution. (B) Contrast is enhanced by staining with atoms of heavy metal. (C) Electron beams have much shorter wavelengths than visible light. (D) The electron microscope has a much greater ratio of image size to real size.