Final answer:
The volume of the ramp cannot be determined without knowing its dimensions.
Step-by-step explanation:
In order to determine the volume of the ramp, we need to know the dimensions of the ramp.
Without that information, we cannot calculate the volume.
Therefore, we cannot determine if any of the given options (a) 18 ft³, (b) 24 ft³, (c) 27 ft³, or (d) 32 ft³, is correct.