A particle having a charge 1.60×10-19 is at a distance 2cm from a point. What is electric dipole moment?

Q. A particle having a charge 1.60×10-19 is at a distance 2cm from a point. What is electric dipole moment?
(A) 2.6×10-21 · Cm
(B) 2.6×10-23 · Cm
(C) 3.2×10-21 · Cm
(D) 3.2×10-23 · Cm

The answer is: (C) 3.2×10-21 · Cm