Which Statement About the Gulf of Mexico's "Dead Zone" Is

Which statement about the Gulf of Mexico's "Dead Zone" is false?

A) The dead zone dissipates in fall with the arrival of storms and cooler weather.
B) The Gulf of Mexico is stratified,with warmer,oxygen-rich water on top and cooler,low-oxygen water on bottom.
C) Most oxygen in the bottom layer is consumed by bacteria decomposing algae.
D) Engineering and wetland degradation contribute to dead zone formation.
E) Negative effects from the dead zone are short-term and confined to the immediate area.