Answer:
World powers like the United States and the Soviet Union (or its modern-day counterpart, Russia) intervening in smaller conflicts often significantly alters the dynamics of these wars. The most accurate statement from the options you've provided would be:
"It can enable both sides to have better weapons, making war more devastating."
Here's why:
1. Often, major powers provide military aid, including advanced weaponry, to the factions they support. This can escalate the conflict by making it more deadly and destructive.
2. The involvement of world powers can also prolong conflicts. If one side is losing, the backing of a powerful nation can prevent them from being defeated, keeping the war going. This happened during the Korean War and the Vietnam War, where major powers' intervention resulted in long, drawn-out conflicts.
3. World powers can also introduce new tactics and strategies to the conflict, changing the way it is fought. For instance, they might provide training or intelligence that enables their allies to fight more effectively.
It's important to note that while these are general patterns, the specific impact of foreign intervention can vary depending on the situation. For example, sometimes intervention can help bring conflicts to a close by supporting peace negotiations or enforcing ceasefires. So, while the statement "It can enable both sides to have better weapons, making war more devastating" is generally true, there are exceptions.