Use this case study and chart to answer the following question:

Case Study: The Growth of New Orleans

The City of New Orleans was founded by the French in what was an important but swampy region of the south along the banks of the Mississippi River. A few short years after its founding, the city was made the capital of the French territory of Louisiana. It would take another 50 years or so before fur and game trading was replaced with a more productive industry—sugar. The city's location at the mouth of the Mississippi River proved useful for moving goods up into the continent as well as making it easy to trade with Europe. Soon New Orleans was a busy and rapidly growing city, becoming the seventh most populated city in the New World by 1810.

New Orleans' location in the swamps, while helpful for trade, was not always helpful to people of the city. New Orleans had problems with flooding and drainage of sewage. Disease spread rapidly thanks to an also thriving population of mosquitoes. Lack of sanitation and no public water made it hard to defend against outbreaks of malaria and yellow fever outbreaks of which occurred as recently as 1905.

Image contains a graph and a table. The title of the image is: The City of New Orleans. The graph contains population numbers from 1810 to 1900. The table also contains population numbers from 1810 to 1900 and also contains New Orleans

According to the passage, which of the following was the most significant cause of New Orleans' rapid growth between 1810 and 1840?

The sugar industry
Fur and game trading
The city's location
Being named the capital of Louisiana