—Thanks for your help, but can you do me one more favor, please?

—________, Sir．What’s it then?

A．Just a minute

B．My pleasure

C．That’s right

D．At your service

复分解反应中有一类特殊的反应——中和反应，下列反应属于中和反应的是( )

A．2HCl+CuO= CuCl₂+H₂O

B． 2NaOH+CO₂= Na₂CO₃+H₂O

C．2HCl+Cu(OH) ₂= CuCl₂+2H₂O

D． CaO+H₂O= Ca(OH) ₂