<span>(D) is the most correct answer. Pinckney's Treaty, also known as the Treaty of San Lorenzo, gave the US shipping rights on the Mississippi River and transport through New Orleans. The problem, at the time, was that even though the Mississippi River was under US control, the southern part was claimed by the Spanish. This led to a border dispute: Pinckney, then the minister to Great Britain, was the creator of the treaty that resolved this dispute in the late 1790s.</span>
C) The British navy had only 16 warships available for the conflict with the United States
For the answer to the question above, this refers to Three-Fifth Compromise where the South used the number of slaves in its territories to increase its representation. It gave the South more power by using the slave population to its advantage. This would threaten the balance of power, particularly to the Northern States.