Final answer:
The correct answer is b) Megalith, which refers to large stones used in prehistoric monumental construction, such as the stones used in Stonehenge.
Step-by-step explanation:
A very large stone used as found or roughly dressed could be categorized as either a monolith, megalith, menhir, or masonry. However, based on our available references, the correct answer is b) Megalith. Megalithic refers to constructions involving large stones, often in prehistoric times. This kind of architecture includes well-known structures such as Stonehenge and various other monuments around the world. The massive stones used in these constructions, which could weigh several tons, are a subject of great archaeological interest concerning how ancient civilizations transported and erected them without modern machinery. For example, Stonehenge's bluestones were brought from the Prescelli Mountains, some 150 miles away, before the invention of the wheel, while the larger Sarcen stones were transported from about 25 miles away.