If objects that are only a few nanometers in size can be seen only with an electron microscope, then objects that are a few nanometers in size can be seen only with:?

Answer choices:
- an electron microscope
 - refraction of light
 - matter vibrating
 - ultrasound
 - The bending of a ray of light
 - slight magnification
 - flashlights
 - lens

 

 an electron microscope         