Final answer:
The volume of a cube with a side length of 3 units is calculated using the formula V = s³, yielding a result of 27 cubic units, which corresponds to option A.
Step-by-step explanation:
The volume of a cube can be calculated using the formula V = s³, where V is the volume and s is the length of one side of the cube.
For a cube with a side length of 3 units, the volume is calculated as follows:
V = 3 units * 3 units * 3 units = 27 cubic units
Therefore, the volume of the cube is 27 cubic units, which corresponds to option A) 27 cubic units.