The shoreline shown on nautical charts of areas affected by large tidal fluctuations is usually the line of mean __________.

Correct Answer: Option B — high water

Nautical charts typically depict the shoreline at the line of Mean High Water (MHW). This convention provides a consistent boundary for land features and is the standard datum used by NOAA for charting coastal areas, ensuring that the charted shoreline reflects the limit of the average high tide.