C) Eukaryotic DNA is linear, whereas most prokaryotic DNA is circular  


Eukaryotic cells and prokaryotic cells have many differences between them. Among these differences prokaryotic cells are distinguished from eukaryotic cells by their structure. While eukaryotic cells have complex structures consisting of inner membranes, cytoskeleton and a nucleus, prokaryotic cells do not contain nuclei and other membrane-bound organelles.

One big difference these cells have is the shape of their DNA. The prokaryotic cell DNA is generally circular, and has no association with histone proteins.  On the other hand, DNA from eukaryotic cells is linear, is within the nucleus, and is associated with histones.