How did the Vietnam war served as a proxy conflict of the Cold War ?

THE COLD WAR WAS A CONFLICT AFTER WORLD WAR II BETWEEN THE U.S. AND SOVIET UNION. THE SUPERPOWERS NEVER FOUGHT EACH OTHER, BUT BACKED OPPOSITE SIDES IN “HOT WARS,” OFFEREDAID TO INFLUENCE NEUTRAL COUNTRIES, AND COMPETED IN A DANGEROUS NUCLEAR ARMS RACE. IT LASTED 45 YEARS, BUT ENDED SURPRISINGLY FAST.

Explanation:

Why is the Vietnam War considered a "proxy war" to the Cold War?  

The Vietnam War can be considered a "proxy" war in the Cold War. Although the Soviet Union and the United States did not directly go to war, they each supporteda different side in the war.

the answer is a. 250 percent.