Classify the following items based on their primary source region in the Indian Ocean Trade Networks: silk, black pepper, porcelain, and astrolabe.

Silk and porcelain both come from China, where the Chinese dynasties produced fine textiles and glazed ceramics that were shipped across the Indian Ocean. Black pepper originates from the Malabar Coast of India, a region famous for its spice production that fed traders from Arabia to Europe. The astrolabe, an instrument for navigation, was developed in the Islamic world, especially in Persia and the Arabian Peninsula, and then spread through the Indian Ocean trade. Thus, silk and porcelain belong to China, pepper to India, and the astrolabe to the Middle East. This classification shows how different goods highlight distinct source regions within the same trade network.