What coordinate system corresponds to the Web Mercator?

The Web Mercator coordinate system is indeed accurately described by WGS84 Web Mercator. This system is a variant of the Mercator projection specifically designed for web mapping applications, such as Google Maps and other online mapping services.

The significance of WGS84 lies in its use as a standard for global positional referencing. This geographic coordinate system is based on a geographic coordinate framework that specifies locations on the Earth's surface through latitude and longitude, which makes it compatible for web-based mapping.

In the context of Web Mercator, the projection transforms these geographical coordinates into a flat map format that maintains straight lines for navigation, thus making it particularly useful for typical city and regional maps where quick visual alignment is more important than precise area or distance calculations.

Other coordinate systems mentioned, such as NAD27 UTM and NAD83 GCS, refer to different projections and reference frames that do not correspond to the web-centric approach of Web Mercator. As a result, they do not serve the same purpose or applications in web mapping technologies. The use of WGS84 specifically as the reference for the Web Mercator system makes option B the correct choice.