The Left Part of the Figure Shows a Dipole Oscillating

The left part of the figure shows a dipole oscillating in a sinusoidal function. Which of the curves best represents the electric field along the axis of the dipole?

A) 1 - sinusoidal wave in the plane of the dipole
B) 2 - sinusoidal wave perpendicular to the plane of the dipole
C) 3 - circular wave perpendicular to the plane of the dipole
D) 4 - circular wave in the plane of the dipole
E) None of these is correct.