The correct answer is C. destruction.
Subversion is the act of undermining or overthrowing something established or traditional. In the context of the question, subversion of institutions by extremists would mean that extremists are trying to destroy or weaken the institutions that make up a society. This could include things like the government, the media, the education system, and the justice system.
Domination is the act of ruling or controlling someone or something. Subservience is the state of being subservient, which means being obedient or submissive to someone or something. Subordination is the act of subordinating someone or something, which means placing them in a lower position or rank.
In the context of the question, domination, subservience, and subordination are not as serious as destruction. Domination and subservience could be seen as a way of controlling or manipulating institutions, but they do not necessarily mean that the institutions are being destroyed. Subordination could be seen as a way of weakening institutions, but it does not necessarily mean that they are being destroyed.
Destruction, on the other hand, is the most serious of the four options. It means that the institutions are being completely ruined or abolished. This would have a devastating impact on a society, as it would leave it without the institutions that it needs to function properly.
Therefore, the correct answer is C. destruction.