Why Did Napoleon Ultimately Choose to Sell All of Louisiana

Why did Napoleon ultimately choose to sell all of Louisiana to the United States?

A) He had just conquered Santo Domingo and wanted to focus his energies there.
B) He was afraid that the Spanish might wage a new war to seize Louisiana.
C) He had a different strategy for attaining a New World empire.
D) He feared that if he held onto Louisiana, America might form an alliance with Britain.
E) He was concerned that Spain might complicate his plans by demanding the return of its former territory.