Answer :
We have that Decreasing the concentration of OH- ionsD will decrease the pH of a base in a solution at the equilibrium
it is important to note that the pH of a solution is neither at equilibrium ,acidic or a base
And for the pairing of H+ and OH- the increase of one reduces the other
Therefore
Increasing the initial concentration of soluteB will leave it at equilbrum
Decreasing the amount of water added to the soluteC will increase its pH
Decreasing the concentration of OH- ionsD. will increase its pH
Decreasing the concentration of OH- ionsD will decrease the pH of a base in a solution at the equilibrium
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