The correct answer is Choice B.
Use the formula for the volume of a cone with the given radius, $3$cm, and height, $6$cm.
Choice A is incorrect and may result from finding the area of the base (circle), not the volume of the cone.
Choices C and D are incorrect and may result from mistaking the coefficient when finding the volume of a cone.
✨ Expert's Tip ✨
Remember to use the radius of the cone, instead of its diameter, for the volume calculation.