John Green, in his educational content, typically emphasizes the economic motivations behind the French and Indian War. The principle cause is generally viewed as the competition for territorial expansion and resources, which ties into the mercantilist policies of the time. Therefore, the most fitting option from your list would be:
Economics -- gaining raw materials through territorial gains (mercantilism)
This highlights how the desire for resource acquisition and control of trade routes led to escalating tensions and ultimately the conflict.