The correct answer to this open question is the following.
Although there are no options attached we can say the following.
President Jefferson decided that the government's treaty-making powers allowed for the purchase of the entire Louisiana territory. Indeed Thomas Jefferson used his treaty-making power to close the purchase of the Louisiana Territory.
US President Thomas Jefferson completed the Louisiana purchase even though he thought that this decision was not specifically authorized by the United States Constitution. So he feared that this decision could be unconstitutional.
However, Jefferson opted to move on with the purchase that was concluded in 1803. President Jefferson had sent James Madison to Paris, France, to help Robert Livingstone, who was the US minister to France, to conclude the negotiations. France sold the Louisiana territory for $11,250,000. It represented about 820,000 square miles of territory.