(A)3Cu+8HNO3→3Cu(NO3)2+2NO+4H2O(B)Cu+4HNO3→Cu(NO3)2+2NO+2H2O(C)3Cu+8HNO3→Cu(NO3)4+NO+2H2O(D)Cu+4HNO3→3Cu(NO3)2+2NO+4H2O