All of these can affect the rate at which a solid dissolves in water except - a.) decreasing air pressure
b.) stirring the water
c.) increasing the temperature of the water
d.)using larger crystals of the solid

d.) using larger crystals of the solid.

Explanation:

All of these can affect the rate at which a solid dissolves in water.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.