Correct Answer:
A. England
Stonehenge, the world-renowned prehistoric monument, is located in Wiltshire, England. This iconic megalithic structure, consisting of a ring of standing stones, is believed to have been constructed between 3000 BC and 2000 BC. It is a UNESCO World Heritage Site and a significant archaeological landmark, attracting millions of visitors annually. While Scotland, Wales, and Ireland also boast rich histories and ancient sites, Stonehenge specifically is situated within the geographical boundaries of England, making it the correct answer. Its purpose remains a subject of ongoing archaeological and historical debate.