下列各组离子在溶液中可以大量共存的是

A．H⁺、SO₃^2-、S^2-、K⁺

B．Fe³⁺、Cl^-、S^2-、Ba²⁺

C．Cu²⁺、Cl^-、S^2-、K⁺

D．Na⁺、K⁺、S^2-、SO₄^2-

--- May I use your mobile phone?

--- _________ .

A．Why not?

B．Go ahead.

C．OK, enjoy yourself

D．Yes, but you’d better not.