The part of French society that was affected by the adoption of the Napoleonic Code is the legal system. Option C is correct.
The Napoleonic Code generated a great influence on the world, since it was a modern legal code and it influenced several countries outside of Europe, although it was not the first modern legal code to ever be made. The Napoleonic Code forbade privileges according to birth, allowed freedom of religion, and was very specific in terms of government jobs which were provided just to those who were qualified for them.