Which point would be the appropriate VOR COP on V552 from the LFT to the TBD VORTACs?

The appropriate VOR Changeover Point (COP) is determined by the maximum distance a pilot can be from the VOR station while still receiving a reliable signal for navigation. In this case, the correct answer indicates that the COP is located at 34 nautical miles (DME) from the LFT VORTAC.

This specific distance means that at 34 DME, the signal from the LFT VORTAC is still strong enough to be used for navigation as the pilot transitions to the TBD VORTAC. It's essential to ensure that there is no potential for signal loss or interference when switching from one VOR to another, and this distance helps to maintain navigational safety during the transition.

Choosing a specific distance like 34 DME implies that navigational aids offer reliable guidance up to that point, and beyond that, pilots are expected to switch to the new VOR frequency to ensure they are using the appropriate navigation aid. Hence, if a pilot is navigating along V552, the COP at 34 DME provides a clear demarcation point for making the frequency change safely and effectively.