If an external force intervenes to give members of a community political self-determination, then that political community will almost surely fail to be truly free,
since it is
during the people's struggle to become free by their own efforts that the political virtues necessary for maintaining freedom have the best chance of arising.
The reasoning above conforms most closely to which one of the following principles?
(A) Political freedom is a virtue that a community
can attain through an external force. - WRONG. Exact opposite to the passage.
(B) Self-determination is not the
first political virtue that the members of a community achieve in their struggle to become free. - WRONG. It is not about whether SD is first political virtue or not.
(C) A community cannot remain free
without first having developed certain political virtues. - CORRECT. Conforms to the blue text(reasoning on offer).
(D) Political self-determination
is required if a community is to remain truly free. - WRONG. Turns sufficiency into necessity.
(E) Real freedom
should not be imposed on a community by external forces. - WRONG. It changes the scope of passage. It's about intervention of external force and the results it had. However, the choice makes an inference based on those results.
Had a hard time picking the answer; it was between C and D for me. Unfortunately chose D but will share my inputs. I might be wrong here though. The question seems to ask about the assumption.
Answer C.