下列反应的离子方程式书写正确的是  [ ]

A．Cu与浓硝酸的反应：Cu+2H⁺==Cu²⁺+H₂↑  

B．FeCl₂溶液与Cl₂的反应：Fe²⁺+Cl₂==Fe³⁺+2Cl^-  

C．H₂SO₄溶液与KOH溶液的反应：H⁺+OH^-==H₂O  

D．CuCl₂溶液与NaOH溶液的反应：CuCl₂+2OH^-==Cu(OH)₂↓+2Cl^-

I want to know _____ do to help my neighbour.  [ ]

A. what I can

B. what can I

C. how I can

D. how can I