With the increase in trade and urban activities during the Tang and Song eras, a. the rural population declined. b. the scholar-gentry provided considerable financial support to Christians. c. the social stagnation of the population became institutionalized. d. a landed gentry class assumed a position of social and economic dominance. e. most of the population resided in urban areas.

d. a landed gentry class assumed a position of social and economic dominance.

Explanation:

The Tang and Song eras were known as the golden age. During this era, the peasants made up the most population. Social groups during the Song and Tang Dynasties divided into two classes: the gentry (nobility) and the peasants. The gentry were land-owning classes and usually had a connection to education. Through education, they held positions in offices.

answer placeholder because the system is messed up

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.