When marking targets, the more effective means of delivering accurate fire is:

The most effective means of delivering accurate fire when marking targets is through the use of an aiming point. An aiming point provides a clear, precise reference for the shooter to align their sights, ensuring that they are accurately focused on the target. This method promotes consistency in shooting and helps to enhance accuracy because it establishes a specific target location that can easily be communicated among team members.

While other methods like pointing with a laser or using verbal confirmation can also support target identification, they do not offer as definitive a means of ensuring the shooter has the right focus for accurate engagement. Using flares, generally intended for illumination, may assist in marking the location but lacks the precision in providing a direct aiming reference. Therefore, the aiming point stands out as the most effective method for ensuring accuracy when delivering fire on a designated target.