Electric charges \[q,\,q,\,-2q\] are placed at the corners of an equilateral triangle \[ABC\] of side \[l\]. The magnitude of electric dipole moment of the system is [MP PMT 1994]

• A.                    \[ql\]
• B.                                      \[2ql\]
• C.                    \[\sqrt{3}ql\]                                 
• D.                                      \[4ql\]