Diocletian divided the empire

a.

into four units.

c.

into provinces.

b.

into north and south.

d.

among his sons.

I'm pretty sure that he divided it into east and west, which doesn't make sense because that isn't one of the answers. But this was a part of my history class last year and i remember it being East and West, so I would just go with B) North and South because that's the closest