Final answer:
The dispute over Oregon was between the United States and Great Britain, and the Adams-Onís Treaty ended Spain's claim on the Oregon Territory.
Step-by-step explanation:
The dispute over Oregon was between the United States and Great Britain. The Adams-Onís Treaty resolved a border dispute over Florida and other territorial issues.
The correct option in regard to the Adams-Onís Treaty is that it ended Spain’s claim on the Oregon Territory, which the treaty did among other things.
Specifically, in 1819, through the Adams-Onís Treaty, Spain relinquished its claim to Oregon, while the United States renounced its claim to Texas, at least temporarily, and took control of Florida in exchange for $5 million.
Thus, the correct answer to the student's question is option c: It ended Spain’s claim on the Oregon Territory.