A.
The current is A function of time and the MAGNETOmotive force is A function of space;
B.
The magnetomotive force is a function of time and the current is a function of space;
C.
The magnetic force is distributed cosine in space and rotates with time;
D.
The amplitude of the magnetomotive force is pulsating with time, and the magnetomotive force is distributed cosine in space.