Answer:
D. Military conquest
Explanation:
Zhang He was a Chinese explorer who leads seven great voyages on behalf of the Chinese emperor. His seven total voyages were diplomatic, military, and trading ventures, and lasted from 1405 – 1433. However, most historians agree their main purpose was to promote the glory of Ming dynasty China.
Zheng He was the best known of the Yongle emperor's diplomatic agents. His voyages had the effect of extending China's political sway over maritime Asia for half a century.