You are presented with the question "Objects that are a few nanometers in size can be seen only with:" and the following answer choices: 
- an electron microscope
 - refraction of light
 - matter vibrating
 - ultrasound
 - The bending of a ray of light
 - slight magnification
 - flashlights
 - lens

Now knowing that viruses are so small that they can be seen only with an electron microscope and viruses Viruses are very small, a few nanometers in size, choose the best answer.


 

 an electron microscope        