It's "more adults are delaying having children or choosing to remain childless."
The answer is D have a good day
Zheng He's first voyage (1405-1407) began in July 1405. They set sail from Liujiagan Port in Taicang of Jiangsu Province and headed westward. The fleet had about 208 vessels total, including 62 Treasure Ships, and more than 27,800 crewman. They traveled to present day Vietnam.
Mid 1600s is when the system of slavery started