Humans do not discriminate well between the taste of NaCl and KCl because

A) The ion channel on the basolateral membrane is specific for Na⁺ ions
B) It is actually sensitive to Cl^-.
C)The G-protein mechanism for salty taste binds both Na⁺ and K⁺
D) The salty taste in humans is restricted to the circumvallate papillae
E) The ion channel in humans on the apical membrane lets either Na⁺ or K⁺ into the cell.