Which of the following statements would extreme right-wing reactionaries and extreme left-wing radicals most likely agree upon?
A. Those that are best able to rule should rule.
B. The means of production should be collectively owned.
C. Elections serve no useful purpose.
D. Class differences should be eiliminated.
If both left wing radicals and right wing reactionaries have to agree to this, it comes down to A and C. Between those, I would argue that C is the more likely answer.
B and D are statements that only left-wing people would agree with and so you can easily rule those out.
A is probably not the best answer because a really extreme right-wing reactionary might well be a monarchist. Such a person might not agree that those best able to rule should rule. Instead, they might say that those who traditionally hold power should continue to hold that power regardless of whether they are truly the most able people.
C is probably acceptable to both. Left wing radicals believe in things like the dictatorship of the vanguard party. There were no real elections in the Soviet Union. At the same time, right wing reactionaries would believe that the mass of people are too stupid to rule themselves and that elections, therefore, are not a good way of getting a good government.
For these reasons, C is the most likely answer.