The equation is:4Al+3O2----2Al2O3
The correct response I believe is D. The reaction rate increases because the probability of collisions increases as there are more Zn atoms to react.
It is a Physical property because like water it changes into a ice cube but it can be melted into water or be turned back into an ice cube.
Just choice D.
If you find the number of atoms of each element, you will find that only choice D has the same amounts on each side of the equation.