Magnesium metal reacts with oxygen according to the equation: Mg(s) + O2(g) → 2MgO2(s)

Which of the following would increase the rate of the reaction?

grinding the magnesium metal into a fine powder

packing the magnesium tightly at the bottom of the container

forming the magnesium metal into the shape of a sphere

forming the magnesium metal into single, large cube