Detailed Explanation:

Answer: Option 4 — Cotton, silk, saltpetre and opium

In the middle of the 18th century, Bengal was the richest province of the Mughal Empire and the primary base for the English East India Company's trade operations. The staple export commodities from Bengal during this period were cotton and silk textiles (Bengal's world-famous muslins and silk fabrics), saltpetre (essential for gunpowder manufacturing during European wars), and opium (exported primarily to China and Southeast Asia). These four commodities formed the backbone of the Company's highly profitable trade from Bengal.

📝 Short Notes: East India Company's Trade from Bengal (Mid-18th Century)

• Cotton and Silk Textiles: Bengal's fine muslins, silk fabrics, and other textiles were the most valuable exports to European and Asian markets. Cities like Murshidabad, Dhaka, and Kasimbazar were major textile centers.
• Saltpetre (Potassium Nitrate): A critical strategic commodity used in gunpowder production. Bengal supplied the bulk of Europe's saltpetre needs during the frequent 18th-century wars. The Company held a virtual monopoly on saltpetre trade.
• Opium: Produced primarily in Bihar and Bengal, opium became increasingly important for trade with China. While the Company formalized its opium monopoly in 1773, it was already a significant export by mid-century.
• Direction of Trade: India was a net importer of precious metals (gold, silver, copper) as Europeans paid for Indian goods with bullion. This makes Option 3 incorrect—metals flowed into, not out of, India.
• Other Commodities: Sugar and indigo were also exported but were not as dominant as the four staple items. Raw cotton (Option 1) became more important in the 19th century during industrialization.