Final answer:
Stonehenge is an example of monumental architecture, a prehistoric megalithic monument constructed by Neolithic people for ceremonial or religious purposes.
Step-by-step explanation:
An example of monumental architecture is a) Stonehenge. This prehistoric structure is a megalithic monument located on the Salisbury Plains in England, recognized for its massive stone circle. The Neolithic people, transitioning from nomadic to farming lifestyles, constructed Stonehenge and other megalithic henges across Western Europe. These large stone structures served various purposes, including ceremonial, religious, and possibly astronomical functions. Stonehenge, in particular, was built in stages over several centuries and is an enduring testament to the ingenuity and spiritual life of the Neolithic society.