If BM 12 has an elevation of 27.048 meters and it is higher than BM 13, what is the most probable elevation of BM 13?

To determine the most probable elevation of BM 13, we start with the information given: BM 12 has an elevation of 27.048 meters and is higher than BM 13. This means that the elevation of BM 13 must be lower than 27.048 meters.

Each of the available options presents a different possible elevation for BM 13, all of which are below 27.048 meters, which aligns with the requirement that BM 12 is at a higher elevation. To identify the most probable elevation among the choices, we consider the smallest reasonable difference from BM 12's elevation.

The options given are close to each other, and among them, 26.181 is the highest and therefore the least lower than 27.048 while remaining below it. It indicates a plausible and reasonable elevation for BM 13 that indicates a minor elevation difference, typical in practice when evaluating benchmark heights in surveying.

The other choices present elevations that are more significantly lower and may not reflect typical variations in elevation found in practical applications. Therefore, the most probable elevation for BM 13, considering it should be just below BM 12 while still being a valid estimate reflecting common differences in benchmark height, would logically be 26.181 meters.