What is a smoke grenade shaped like?

The correct choice is that a smoke grenade is shaped like a beer can. This design allows for efficient storage and handling while maintaining a compact and cylindrical form that is easy to grip and throw. The shape is functional; it provides stability when deployed and prevents rolling away once it is thrown. The cylindrical form helps ensure that the internal mechanisms can function effectively, enabling the grenade to produce a dense cloud of smoke when activated. Understanding the design aspects of smoke grenades is crucial for military personnel, as the shape influences both usage and effectiveness in the field.

The other options do not accurately represent the typical profile of smoke grenades, as they either do not provide the same functional benefits or do not match the common design found in military supplies.