Answer:
C Significant change in history = To sway the fate of nations
Step-by-step explanation:
If we take a close look to the central idea of Queens of the Spy World Whose Intrigues Sway the Fate of Nations, the word that keeps lingering is the verb to sway, meaning move (or cause to) slowly rhythmically back- and forward. So Nations can be swayed by female spies, i.e. they fall back and then they move forward (or the other way around) by the female intrigues of spies. I personally don´t consider (thinking of Mata Hari) their influence in world politics that big, but the central idea is best summarized in C.