Concept:The option that did not lead to the revival of old trade patterns under Omani rule is the attack on the Portuguese in the 1640s.
Explanation:The Omani challenge to Portuguese control occurred mainly in the late 17th century, not the 1640s.
The decisive event was the Omani capture of Fort Jesus in 1698, which ended Portuguese dominance on the East African coast.
Indian capital helped finance trade caravans into the interior.
Increased demand for slaves, especially from French islands in the Indian Ocean, encouraged the slave trade to expand.
Africans in the interior were willing to bring slaves and goods to the coast for exchange.
Therefore, all these factors supported the re-emergence of old trade patterns, except the 1640s attack on the Portuguese.
Answer:C. Attack on the Portuguese in the 1640s.