Founded in 1386, the oldest university in Germany and one of the oldest three universities in European Continent (not including the UK) is the University of Heidelberg. The university is located in a beautiful city in southwest of Germany, Heidelberg. With a population of only 130,000, the city attracts millions of tourists from worldwide every year. Unlike other universities in Germany, Heidelberg University is not situated in a fixed area. Instead, it is dotted among the ancient old downtown areas. Tourists often find one of its faculties (系，科) here, and another one there, just beside the bustling commercial area. The university has about 24,000 students, among them more than 4,500 international students, and is regarded as an important center of modern research and study in Germany. Its fifteen faculties cover a wide area of subjects in the arts and sciences, including medicine. The university does not offer courses in engineering and agriculture. Where is Heidelberg University located
A. A fixed place in modern downtown areas. B. An unfixed place in ancient rural areas. C. A fixed place in ancient rural areas. D. An unfixed place in ancient downtown areas.