Final answer:
In Chesapeake Bay, fjords did not form during or after the Last Glacial Maximum; this region features valleys, glacial moraines, and coastal plains but not the steep valleys inundated by seawater that characterize fjords.
Step-by-step explanation:
The topographic feature that did not form during or after the Last Glacial Maximum (LGM) in Chesapeake Bay is D) Fjords. Fjords are typically formed in places where glaciers have carved deep, narrow valleys that later become inundated by sea level rise. Chesapeake Bay's geological history includes the formation of valleys, glacial moraines, and coastal plains, but not fjords.
The Chesapeake Bay region was shaped by the effects of glaciation, including the deposition of glacial till and the creation of coastal plains due to the rise and fall of sea levels associated with glaciers advancing and retreating. However, the specific geography of the Bay did not allow for the development of fjords, which are more commonly associated with the steep and rugged coastlines found in places like Norway and the Pacific Northwest of North America.