_____ normally produces the specific effect on a target with the minimum expenditure of ammunition.

The correct answer indicates that massing fires is a tactic used to achieve significant impacts on a target while conserving ammunition. This method involves concentrating artillery and other indirect fire assets on a specific target or area to ensure that the force applied is overwhelming enough to achieve the desired effect efficiently. The goal is to produce the required damage or disruption with the least amount of firing, which reduces overall ammunition expenditure and enhances the effectiveness of the fires delivered.

Massing fires allows for a focused and precise approach to target engagement, ensuring that the firepower is effectively utilized in a way that maximizes the impact on the enemy while minimizing resource wastage. This technique is critical in tactical scenarios where both efficiency and effectiveness of fire support are necessary for mission success.