Final answer:
Option (c), Conservatives are most likely to support an arranged marriage between royalty of different nations for political reasons, as it aligns with their goal to maintain traditional structures and enhance power.
Step-by-step explanation:
The group most likely to support an arranged marriage between the prince of one nation and the princess of another, particularly if it's for political reasons, would be c) Conservatives. In the aftermath of 1848, conservative monarchs aimed to co-opt the idea of nationalism to strengthen their power. This political strategy aligns with the conservative tendency to maintain existing social structures and institutions, including arranged marriages that serve to unite nations or solidify alliances.