Final answer:
The volume of the pyramid is x²y cm³.
Step-by-step explanation:
The volume of a solid right pyramid is given by the formula V = (1/3) * A * h, where A is the area of the base and h is the height.
In this case, the base is a square with side length x, so the area of the base is A = x^2. Substituting this into the formula, we get V = (1/3) * x^2 * y.
Therefore, the expression that represents the volume of the pyramid is option 2) x²y cm³.