Which of the following statements most accurately explains why Ming China ceased its voyages of exploration in the Indian Ocean basin during the fifteenth century?

The cessation of Ming China's voyages of exploration in the Indian Ocean basin during the fifteenth century primarily resulted from a strategic shift in resource allocation to defend against threats on China's northern frontiers. During this period, the Ming dynasty faced increasing challenges from nomadic invasions, especially from the Mongols and other northern tribes. This situation compelled the Ming emperors to prioritize military preparedness and the fortification of the Great Wall and other defense systems.

As resources were diverted toward these pressing security needs, the vast, costly maritime expeditions that had been undertaken, notably by Admiral Zheng He, became increasingly difficult to justify. The emphasis on land-based defense and internal stability overshadowed the earlier interests in exploration and trade. This shift had significant implications for China’s international relations, trade dynamics, and cultural exchanges during and after the Ming Dynasty.