The different classes of service effectively represent the different level of service that the reservist is giving at any given point in time, from part-time service in the class A world to deployed operations or employment at sea, which is the class C, which is essentially equivalent to their regular force colleagues, with the same compensation, benefits, and the like.
Within Canadian Armed Forces military personnel generation, there is currently under way an analysis of the entire question of retention and compensation and benefits—a first principles study, I think they're calling it—which will review whether it's time to change how the terms of service work, the compensation and benefits, and exactly that type of thing. I don't have any knowledge at this time of their progress, but certainly the commander of military personnel generation is probably able to respond to that question more clearly.