Final answer:
Cytoplasm is found only in cells, as all cells have it as a common component along with a plasma membrane, DNA, and ribosomes. Viruses, being acellular, do not have cytoplasm but rely on host cells for replication.
Step-by-step explanation:
The subject at hand is the cytoplasm, which is a component found within cells. When considering whether cytoplasm is found in viruses, we should understand that viruses are acellular. This means they do not possess typical cellular components like the cytoplasm. Instead, viruses rely on host cells to replicate and do not carry out metabolic processes on their own.
Thus, the correct option in reference to the question would be "C) found only in cells". All cells, whether prokaryotic or eukaryotic, contain cytoplasm. It is part of the common components shared by all cells, which also include a plasma membrane, DNA, and ribosomes. Cytoplasm is the jelly-like region within the cell where these and other cellular components are contained. Viruses, on the other hand, do not have cytoplasm, as they are not made up of cells but are instead composed of a protective coating like a capsid that encloses their genetic material.