Select the most appropriate option to fill in the blank.
Truthfully speaking, the victories of peace and harmony have a more _________ impact on human civilisation than the so-called victories of war.

Correct option is C

The most appropriate option to fill in the blank is (c) lasting.
In the context of the sentence, "lasting" is the most suitable word to describe the impact of victories of peace and harmony on human civilization. It suggests that these victories have a long-term and enduring effect.
Meanings for the other options:
 Superior - This means higher in quality or rank, but it doesn't specifically convey the idea of long-lasting impact.
 Transient - Transient means temporary or short-lived, which is the opposite of what the sentence is conveying about the impact of peace and harmony victories.
 Greater - While "greater" can imply a stronger impact, it doesn't specifically address the duration or lasting nature of the impact, which is the focus of the sentence.