D) what is the biggest task the president must complete?
Fair Deal
Truman's social program extending the ideas of the New Deal was referred to as the Fair Deal.
The Fair Deal included laws to expand and support Social Security, raise wages, and prevent racial discrimination in the workplace. However, the economy was a concern after World War II and Congress was unwilling to pass Fair Deal laws during his first term. After winning a second term, Congress agreed to parts of the deal but not the whole program.
The idea of mutually assured destruction was a result of political and military tensions between the US and USSR. Both of these countries built up military technologies that were capable of killing millions of citizens in just a few minutes. Both countries wanted to be able to inflict a severe amount of damage on the other in case of an attack.
This is why the phenomenon of mutually assured destruction was created, as neither country wanted to unprepared if war was to break out between these two countries.