Final answer:
Human cheek cells viewed under a microscope are classified as microscopic, suitable for observation with standard light microscopes, and not visible to the bare eye.
Step-by-step explanation:
Human cheek cells, when viewed under a microscope, are classified as microscopic. This term refers to objects that are too small to be seen with the bare eye and require a microscope to be observed. Since most individual cells, including human cells, fall under this size range, the correct answer is C) Microscopic. These cells are much larger than submicroscopic objects like molecules that cannot be viewed with standard light microscopes and require electron microscopes. Additionally, cheek cells are not macroscopic—which are visible to the bare eye without the need for magnification—and are not ultramicroscopic, a term often reserved for objects that can only be observed with very high-powered magnification such as electron microscopes.