Barium carbonate, BaCO3, is stable at ambient temperatures, but decomposes to barium oxide and carbo — Equilibrium Chemistry Question

Barium carbonate, BaCO₃, is stable at ambient temperatures, but decomposes to barium oxide and carbon dioxide at higher temperatures.
BaCO₃(s) ⇌ BaO(s) + CO₂(g)
At a certain temperature, this system is in equilibrium in a closed system and contains appreciable amounts of all three compounds. Which changes will lead to an increase in the pressure of CO₂ present at equilibrium?
I. Adding more BaCO₃(s)
II. Increasing the volume of the container