Answer:
Your answer is C) Carbon Dioxide.
Where air rises and cools, dropping rain.
Answer: B. the increase in acidity of the rainwater in the southeastern United States
Explanation:
The dredging of thousands of canals throughout the wetlands for easier navigation has sped up the erosion of Louisiana wetlands so option A is false.
The loss of barrier islands on the coast of Louisiana as a result of rising sea levels has also sped up the erosion of the wetlands as they are now more exposed to open water so option C is wrong as well.
The 2010 Deepwater Horizon disaster spilled so much oil that adversely affected the wetlands leading to their erosion so option D is wrong as well.
Option B is therefore right.
I cant really see the picture correctly

When seawater seeps down into the ocean crust and is heated by the magma, it undergoes lots of chemical reactions. When the fluid rises up through the seafloor, it carries many new chemicals with it, such as-- copper and zinc.
These chemical reactions also remove chemicals from the seawater, such as oxygen and magnesium.
So clearly vebtus fluid is different from sea water .
HOPE IT HELPS YOU.