Final answer:
The correct option is c) Monolith. The correct term for a large, single block of stone, often fashioned into an obelisk or column, is 'Monolith'. This term reflects monumental architecture like that of Stonehenge's trilithons from Neolithic times.
Step-by-step explanation:
A student is asking about a term describing a large, single block of stone fashioned into an architectural feature. Given the definitions provided, the answer is c) Monolith. An obelisk is an example of a monolith and is characterized by a tall, four-sided tapering structure with a pyramidal top, often used as a monument.
Monolithic architecture can be seen in historical constructions like Stonehenge, where the trilithons consist of two vertical megaliths with a third stone set horizontally across the top in a post-and-lintel system. This monumental style is rooted in Neolithic times and is known for its megalithic structures.