Which statement best describes the maximum effective range of the 81mm mortar?

The maximum effective range of the 81mm mortar is accurately described as 4000 meters. This range reflects the distance at which the mortar can effectively deliver indirect fire, taking into account factors like projectile type and elevation of the firing unit. Understanding the effective range is crucial for accurate targeting and ensuring that indirect fire support meets the tactical requirements on the battlefield.

The other distances presented do not align with the established capabilities of the 81mm mortar system, making them less relevant in operational scenarios. Hence, knowing that 4000 meters is the correct figure helps in planning fire missions and understanding the limitations and capabilities of this artillery piece.