Without the actual image to analyze, I can infer the best answer based on historical context regarding James Oglethorpe and the recruitment of the Highland Scots. Oglethorpe recruited the Highland Scots primarily for their military skills and loyalty, which made them valuable for defense against potential Spanish attacks, particularly from Florida. Therefore, the best choice is:
C. Based on the weapons in the image, the Highland Scots were used to defend the Georgia colony against the Spanish threat in Florida.