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B. Increases its pressure.

A. Be prepare for a sea level rise.

B. The density would decreases.

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.

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]