Answer:
It allowed an exodus of thousands of East Germans fleeing to West Germany via Hungary. The Peaceful Revolution, a series of protests by East Germans, led to the GDR's first free elections on 18 March 1990, and to the negotiations between the GDR and FRG that culminated in a Unification Treaty.
Option C would be the best answer. You don't use a poll to leak info, stop corrupt systems or raise power.
It would have reduced the number of foreign-born people entering the US
Manifest Destiny was the idea that the US had the right towards expansion in the americas