With The Soviet Unions collapse, The US's main enemy that it had been opposed to for years was no longer occupying its time. Very quickly, the US turned its focus towards the many terrorist factions in the middle east, some of which it had facilitated. This lead to things like 9/11 and the Iraq war. Additionally, all the territory that had been previously been controlled by the Soviet Union near the middle East (Kazakhstan) were released and left to their own devices.
I’m pretty sure it’s C because all throughout history women have worked on this but in the 1800-1900s more women joined together and brought many changes to the way society functions today. Hope this helps!