Spironolactone Produces Its Potassium-Sparing Diuretic Effect by Being an Aldosterone

Spironolactone produces its potassium-sparing diuretic effect by being an aldosterone receptor agonist that:

A) aldosterone receptor agonist that stimulates sodium and potassium exchange.
B) aldosterone receptor agonist that stimulates hydrogen and potassium exchange.
C) aldosterone receptor antagonist that inhibits sodium and potassium exchange.
D) aldosterone receptor antagonist that inhibits hydrogen and potassium exchange.