Assume a charged particle following a helical path in a magnetic field has a component of its velocity which carries it toward a region of stronger field. According to the classical loop model, how will the particle's motion evolve?
A. It will maintain a constant velocity along the field lines.
B. The component of its velocity parallel to the field will remain constant but it will spiral outward as it moves in a circular path of increasing radius.
C. Its velocity parallel to the field will increase.
D. It will slow down as the component of its velocity along the field becomes smaller, until it reverses direction and begins to accelerate away from the region of stronger field.