The invention of the electron microscope led to a major breakthrough in the study of cells. What could be the reason for this?

• A
  Electron beams can pass through thicker specimens,whereas light microscopy requires very thin sections.
• B
  Electron microscopes are more powerful than light microscopes because they use electron beams,which have a much longer wavelength than photons.
• C
  The resolving power of an electron microscope is many times higher than that of a light microscope.
• D
  The resolving power of an electron microscope is $100-350 \ nm$,while that of a light microscope is $0.1-0.2 \ nm$.