If a Modern Electron Microscope (TEM)can Resolve Biological Images to the Nanometer

Multiple Choice

If a modern electron microscope (TEM) can resolve biological images to the nanometer level, as opposed to the best light microscope, this is due to which of the following?

A) The focal length of the electron microscope is significantly longer.
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 much greater ratio of image size to real size.
E) The electron microscope cannot image whole cells at one time.