All the following except one led to the re-emergence of old trade patterns under Omani rule

All the following except one led to the re-emergence of old trade patterns under Omani rule: attack on the Portuguese in the 1640s. The re-emergence of old trade patterns under Omani rule was due to a number of factors, including the availability of capital from India, the increased demand for slaves, and the willingness of Africans in the interior to take slaves to the coast. These factors created a favorable environment for the revival of trade, which had declined under previous rule. The Omani empire took advantage of this situation and established itself as a major player in the trade of goods and slaves along the East African coast. The attack on the Portuguese in the 1640s, on the other hand, had little to do with the revival of trade patterns and was more related to the competition for control over the region and its resources.