The correct answer is C) Allied leaders compromised and agreed to open a second front in France.
The results of the Tehran conference compared with the goals of Allied leaders were that "Allied leaders compromised and agreed to open a second front in France."
The three Allied leaders in World War II met in Tehran, to define the strategy to follow in that stage of the War. Soviet Union Joseph Stalin, Great Britain Prime Minister Winston Churchill, and US President Franklin D. Roosevelt got together on November 28, until December 1, 1943, and agreed to open up a new war front in France to fight the Gerrman Army. They planned the invasion of France for June 6, 1944.
The main cause of World War I was actually a wrong turn. The assassination of Archduke Franz Ferdinand in Sarajevo on 28th June 1914, it triggered a chain of events that resulted in World War 1.
Because when people charged from the trench they were most likely killed in what is called no mans land.Trench warfare resulted in little territorial gain