Which of the Following Is an Accurate Statement

Which of the following is an accurate statement?

A) Magnetic field lines have as their sources north and south poles.
B) A magnetic field line is,by definition,tangent to the direction of the magnetic force on a moving charge at a given point in space.
C) The magnetic force on a moving charge does not change its energy.
D) The magnetic force on a current-carrying wire is greatest when the wire is parallel to the magnetic field.
E) A current-carrying loop of wire tends to line up with its plane parallel to an external magnetic field in which it is positioned.