If the registration point is nearer the last round(s) fired, what is the necessary range refinement?

When the registration point is closer to the last round(s) fired, it indicates that the previous shots have adequately calibrated the aiming point. In this scenario, no range refinement is necessary because the existing data from the previous rounds is relevant and accurate for the area being targeted. Therefore, there is no need for adjustment since the previous impacts are already providing a sufficient basis for future firing tasks in that vicinity. This allows for effective and efficient targeting without unnecessary recalibrations.

The other options suggest adjustments that are not warranted in this situation, as those adjustments imply that the initial registration has become inaccurate, which is not the case when the registration point is more proximal to the recent firing.