The correct answer is 2. the North Atlantic Treaty. This treaty, also known as the NATO Treaty, was signed in 1949 and established a collective defense alliance between several European countries and the United States. Its main purpose was to deter potential Soviet aggression and provide a unified defense against any Soviet attack on any member country. It played a pivotal role in maintaining the safety and security of Europe during the Cold War. The other options listed (1. the Treaty of Paris of 1783, 3. START 1, and 4. the Treaty of Versailles) did not directly help secure the safety of Europe during the Cold War.
The treaty that helped secure the safety of Europe during the Cold War is the North Atlantic Treaty, which is option 2.
