Which factor will have little effect on the solubility of saturated solutions?

a.
the temperature of the solvent

b.
the amount of extra time spent stirring the solution

c.
the amount of pressure the solvent is under

d.
the addition of other solutes

I am absolutely sure that the factor which will have little effect on the solubility of saturated solutions is the amount of extra time spent stirring the solution. I choose this option because this point will not make a big difference whereas the rest of option can perform a great impact. 
Do hope you will find it useful!

The answer is letter c

Answer/when the cell uses energy;