The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
The reasons why Napoleon might have had for selling the Louisiana Territory to the United States could have been the following.
Experts agree on two basic reasons for French Emperor Napoleon decided to sell the huge Louisiana territory to the United States. The first reason, France needed a lot of money. It had deep debts as a result of many wars. Secondly, the Lousiana territory was immense and was too far away from France, so it was very difficult to defend.
These circumstances were an advantage to President Thomas Jefferson, who sent James Madison to help Robert Livingston (the Minister to France) in order to accelerate the negotiations to close the Louisiana Purchase in 1803.