The correct option is
C all of the above
A chromosome is an organized structure of DNA and protein that is found in the nucleus of the cell. It is a single piece of coiled DNA containing many genes, regulatory elements, and other nucleotide sequences. Chromosome also contains DNA bound proteins which serve to package the DNA and control its functions. In eukaryotes, nuclear chromosomes are packaged by proteins into a condensed structure called chromatin.
So, the correct option is 'all of the above'.