Of the following substances, an aqueous solution of will form basic solutions.
NaHS Cu(NO₃)₂ KHCO₃ NaF
A) NaHS, Cu(NO₃)₂
B) KHCO₃, NaHS
C) NaF only
D) NaF, KHCO₃
E) NaHS, KHCO₃ and NaF