Considering that being nice (A) did not get results, the only strategy was to be aggressive (E)

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PS: Did was not easy sir to format ??

Thanks for explaining. I guess the phrase unbecoming of political visionaries means not suitable for those people.

Of course, formatting the question was not very difficult.

Breakdown of the Blanks
- Blank (i): (A) supine

The phrase "unbecoming of political visionaries" is the key to this blank. It tells us that the militants saw this type of diplomacy as a weakness and an act of submission. Supine means failing to act or protest as a result of moral weakness or indolence. This fits the description of a diplomacy that the militants would view as cowardly or submissive. The other options do not fit this context. "Wheedling" means using flattery to persuade, and "freewheeling" means careless and without a plan. Neither conveys the sense of weakness implied by the sentence.
- Blank (ii): (E) unremitting

The second blank describes the aggression that the militant branch turned toward. Since the group saw themselves as "visionaries," their aggression would be a strong, unwavering commitment. Unremitting means never-ending or relentless. This word perfectly describes a policy of aggression that would be seen as strong and decisive, a direct contrast to the "supine" diplomacy they rejected. "Verdant" means green with grass or other lush vegetation, and "superfluous" means unnecessary, and neither makes sense in this context.