At the end of the French and Indian War, none of the options listed are directly accurate in terms of the immediate outcomes for the colony of Georgia. However, the closest relevant outcome is related to the changes in territorial boundaries and governance.
The French and Indian War (1754-1763), known in Europe as the Seven Years' War, ended with the Treaty of Paris in 1763, which resulted in France ceding large portions of its North American territory to Great Britain. This treaty did not specifically make the Mississippi River the western boundary of Georgia, but it did alter territorial claims in the region.
Given these options and the historical context, the most relevant option regarding the outcomes of the war would be:
D. The Mississippi river became the western boundary of Georgia.
This reflects the territorial changes that occurred in the aftermath of the war, as British control increased over lands previously claimed by France.