Final answer:
Option (c), President Reagan developed the idea of a divided Europe through personal anecdotes and historical references, citing the 'iron curtain' and the division of Germany, and also through his diplomacy with the Soviet Union.
Step-by-step explanation:
President Ronald Reagan developed the idea that division can be seen all over Europe through personal anecdotes and references to historical events. His recognition of the iron curtain and the division of Germany into East and West showcases the clear divide that symbolized Europe's geopolitical fragmentation during the Cold War era.
Additionally, Reagan's administration, while increasing defense spending, also took significant steps towards improving relations with the Soviet Union by negotiating treaties to eliminate intermediate-range nuclear missiles and by engaging in dialogues with Soviet leader Mikhail Gorbachev.