The cold war earned its name because
a. most of it took place in the north of the soviet union.
b. the most important parts took place during the winter.
c. it described the northern spread of communist governments.
d. it described the cooling of relations between west and east.

D. It described the cooling of relations between West and East.

This is relevant because it occured right after West and East (Specially US and the USSR) were part of the Allies during WWII  and fought together against the Nazis.

The Cold War earned its name because it very accurately described the cooling of relations between West and East. West here represented the democratically elected governments which was spearheaded by the US, while the East on the other hand was spearheaded by the USSR with its satellite states.