The instrument that can be used to see atoms in matter is scanning tunneling microscope. Option A
Scanning Tunneling Microscopy, or STM, is an imaging technique used to obtain ultra-high resolution images at the atomic scale, without using light or electron beams.
Scanning tunneling microscope is based on the special property of atoms known as tunneling.
The electrons through tunnels can enter the surface of an element.
Hence by this microscope, we can indirectly see atoms.
The complete question
Which of the following can be used to see atoms?
A Scanning tunneling microscope
B Compound Microscope
C Stereo Microscope
D Confocal Microscope