Why do you think you aren't able to make a divergent oceanic/continental boundary?

a) Because divergent boundaries typically occur between tectonic plates, not between oceanic and continental crust.
b) Because divergent boundaries are characterized by the separation of tectonic plates, which cannot be simulated in this context.
c) Because the forces involved in creating a divergent boundary are too complex to replicate in a simplified model.
d) Because the materials used to create the model do not accurately represent the geological properties of oceanic and continental crust.