Final answer:
Continental ice sheets often leave a rounded landscape after they retreat, smoothing out the terrain in contrast to alpine glaciation which creates steep bold landforms and is responsible for most hanging valleys. The correct option is B.
Step-by-step explanation:
Continental ice sheets, which are massive ice covers over continents, are known to create certain distinctive landscape features. They do not typically form cirques, which are bowl-shaped depressions found at the heads of glacial valleys and are often associated with alpine or mountain glaciers.
Instead, continental ice sheets often leave a rounded landscape after they retreat, having smoothed out the terrain through the process known as glaciation. This type of glaciation can create landforms such as drumlins and eskers. Continental ice sheets are not known to produce steep bold landforms; this is more characteristic of alpine glaciation that carves out dramatic mountainous features.
Lastly, most hanging valleys are the result of alpine glacial activity rather than continental glaciation. Hanging valleys occur when a smaller glacier flows into a deeper glacial valley, leaving an elevated valley after both glaciers retreat. Therefore, the correct option for continental ice sheets is 'B) Often leave a rounded landscape'.