Which of the following strengthened the central government during the tang and song dynasties

Confucian teachings revived in the Song period. They were important to the civil service, the family system, and politics. Daoism was of great influence on China's reunification under the Tang dynasty

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.