A Student Is Trying to Understand the Possible Reasons That

A student is trying to understand the possible reasons that a genetic abnormality might exist in an individual. Which of the following reasons is most plausible?

A) DNA has combined with several types of protein and a small amount of RNA.
B) Histones have exerted control on the folding of DNA strands.
C) DNA has blocked genetic transcription by preventing access of nucleotides to the DNA surface.
D) Chromatin has maintained its stable structure during the DNA replication process.