Which of these was directly responsible for the outbreak of the world war 1 in europe? entangling alliances us imperialism unrestricted submarines warfare colonial independence movement

How were the okanogan highlands formed? a. by subduction, which caused huge folds in earths surface b. as a result of retreating glaciers carving great valleys into the earth c. when molten rock from under the earth approached the surface d. when the collision of volcanic island chains and ocean rocks formed new earth