下列各组离子，能在强酸溶液中大量共存。并且溶液呈无色的是

A．Mg^2＋、Na^＋、SO₄^2－、Cl^－

B．K^＋、Na^＋、NO₃^－、MnO₄^－

C．Na^＋、Ca^2＋、OH^－、HCO₃^－

D．NH₄^＋、Cu^2＋、NO₃^－、Cl^－

Anna is already ______ girl, but she is lazy. She wants to get her clothes ______ again.

A．a 17-year-old, to wash

B．a 19-year-old, washes

C．an 18-year-old, washed

D．an 8-year-old, washing