Answer:
A. Right Cone
C. Hexagonal prism
Explanation:
The volume of a cone with height h and radius r is 1/3πr^2h, which is exactly one third the volume of the smallest cylinder that it fits inside.
The volume of a hexagonal pyramid with height h and radius r is 1/3πr^2h, which is exactly one third the volume of the smallest rectangular prism that it fits inside.