Why was new orleans vulnerable to flooding when katrina struck?
a.
the city is built on an island.
b.
there are no safeguards between the city and the sea.
c.
much of the city is below sea level.
d.
katrina struck with almost no warning.
i need

C. Much of the city is below sea level.

Explanation:

New Orleans is a city located southeast of the state of Louisiana, United States, on the Mississippi River delta. Before the catastrophe of Hurricane Katrina, in 2005, the population of New Orleans reached 400,000 inhabitants. reducing by half after said destruction; subsequently, its population increased reaching 378,000 inhabitants. in 2013. Most of the city is below sea level. It is flanked by the Mississippi River and Lake Pontchartrain, so it must be protected by levees. Until the beginning of the 20th century, there were strong restrictions on the construction of new buildings; only the high alluvial lands were used, which constituted in themselves natural dams among the multiple tributaries of the Mississippi delta. The rest of the areas are marshy and are subject to frequent flooding.

the answer would be:

b. race