Answer:
Cylinder: V ≈

Explanation:
We need to find the volume of the three solids.
CONE
The volume of a cone is given as:

where r = radius
h = height
The radius of the cone is 5 cm (since its diameter is 10 cm) and its height is 12 cm.
Therefore, its volume is:

SPHERE
The volume of a sphere is given as:

The radius of the sphere is 2 cm (since its diameter is 4 cm).
Therefore, the volume of the sphere is:

CYLINDER
The volume of a cylinder is given as:

The radius of the cylinder is 2 cm and its height is 4 cm.
Therefore, the volume of the cylinder is:

The only one that gives the correct measure of the volume of the given shape is the cylinder.