Answer:
Option C, a human skin cell
Step-by-step explanation:
A light microscope works on the concept of visualizing small and tiny objects through the application of light phenomenon and the optical lenses. A light microscope thus can view small things up to a certain extent and not beyond that.
Here, in this case a human cell can be seen through a light microscope but things smaller than a cell such as DNA, protein, and virus cannot be clearly seen by microscope. However, electron microscope can view these smaller entities.
Hence, option C is correct