Questions Refer to the Passage Below

Questions refer to the passage below.
Silks were still very expensive textiles, but they were no longer reserved for rulers or officials in most parts of Eurasia after the twelfth century. Many different factors, including the various religious movements discussed here, contributed to this result. In this article Buddhist, Christian, and Islamic religious movements and their relationships with the silk trade have been discussed separately. But surely there must have been many links between the three major religious spheres and trade circles. Meanwhile, followers of religions other than Buddhism, Christianity, and Islam were also involved in the silk trade, sometimes as part of their religious activities. For example, Jewish traders who were active in Europe and the Mediterranean basin might have come all the way to central Asia, China, and India. Nestorian Christians are known to have been active in the silk trade. Though estranged from orthodox Christianity, they might still have served as links between the Christian world and Asian lands. Zoroastrians were well-known traders and preachers in Tang China. Manichaeans were found from the Mediterranean to China and left many artistic remains along the central Asian trade routes.
Liu Xinrui, "Silks and Religions in Eurasia, c. A.D. 600-1200,"
in Journal of World History, 1995
-Which of the following is an example of a supporting detail given by the author?

A) Silk was an expensive textile, permitted only to rulers and religious leaders.
B) Manicheans left artistic remains along the central Asian trade networks.
C) Jewish merchants traded in the Mediterranean Sea.
D) The fourteenth century was the high point of the silk trade.