What Did the "War Guilt Clause" in the Treaty of Versailles

What did the "war guilt clause" in the Treaty of Versailles declare?

A) All of the Great Powers involved in the war were equally responsible for starting the war.
B) All of the Great Powers with the exception of the United States were equally responsible for starting the war.
C) The Russian Empire was primarily responsible for starting the war, and the Soviet Union was obligated to pay reparations.
D) Germany (with Austria) was solely responsible for the war and had to pay reparations.