The result of colonial rivalries in North America that stands out among your options is the British alliance with the Iroquois Confederacy. This alliance was strategic in nature, as the British sought to strengthen their position against rival European powers (like the French) and local Native American tribes by securing the loyalty of the powerful Iroquois Confederacy.
The other options, while significant developments in colonial America, are not as directly tied to the concept of colonial rivalries as the alliance with the Iroquois.