The Han period is often considered a Golden Age of Chinese civilization primarily due to option D. Because of advances in science, medicine, technology and the arts.
During the Han dynasty (206 BCE – 220 CE), significant contributions were made in various fields, including the development of the civil service, improvements in agricultural techniques, innovations such as the seismograph and papermaking, and advancements in medicine. Cultural and artistic expression also flourished during this time, leading to a rich legacy that had a lasting impact on Chinese civilization.
While the establishment of the Silk Road (option B) also played a crucial role in facilitating trade and cultural exchanges, the overall advancements in multiple domains are what primarily characterize this era as a Golden Age.