I think we might want a slight tweak here, since the preconventional stage is indeed concerned with reward and punishment, but this is typically broken up into obedience (avoiding punishment) and self-interest (reward), which makes the phrasing a touch redundant
I double-checked and Kaplan has it broken down this way. So it might be self interest (gaining rewards) as well as obedience (avoiding punishment) or whatever phrasing which is, again, the phrasing that Kaplan hew to