This is of no practical ________ at present, but such a prospect is not impossible.[    ]

A. quantity  

B. significance

C. character  

D. fashion

甲国和乙国发生武装冲突，丙国出面劝他们进行谈判，但丙国并未参加该谈判。丙国的行为是：( )

A．调解

B．调停

C．斡旋

D．协商