Answer:
B. Increases its pressure.
A. Be prepare for a sea level rise.
B. The density would decreases.
Step-by-step explanation:
If carbondioxide gas is added to the water, more pressure is needed for it because carbondioxide gas is insoluble in water so due to its insoluble nature , high pressure is needed for its addition. If the sea level rises, the areas along coastal region will sink so we give warning to the people i. e. be prepare for a sea level rise. If the temperature of water increases so its density decreases.