The correct answer is B) if lowering the high corner places the unit in the wave action. When leveling an elevated coastal driller, the preferred method is to lower the high corner to achieve the desired level. However, if lowering the high corner would place the unit in the wave action, it is acceptable to raise the low corner instead. This is to prevent the unit from being subjected to wave forces, which could compromise its stability and safety. The other options are incorrect because: A) Raising the low corner is not always optional, as it should only be done in specific circumstances to avoid wave action. C) Exceeding the proper air gap is not a valid reason to raise the low corner. D) Avoiding a potential punch-through is not a valid reason, as the primary concern is avoiding wave action.