What happened after wu zhao’s death?

a peaceful transition of power to another female ruler.
rebellions broke out and the economy of the empire struggled.
women continued to assume high positions of power in the empire.
confucian scholars were appointed to powerful government positions.

B) Rebellions broke out and the economy of the empire struggled

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Rebellions broke out and the economy of the empire struggled.

Explanation:

Wu Zeitan or Wu Zhao as we know him, was a Chinese official from the Tang Dinasty that ruled "unoficially" the empire from 690-705 when he died, in this period of Chinese history there was an emperor and a supreme general of the forces, who was the one that actually ruled the country and kept everything undercontrol, once Wu Zhao died since there was no one to keep in control and guarantee security for the emperor pleasants started to rebel agaisnt the empire and since an insecure environment does not make for a great economy to flourish, the empire struggled economically.

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

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.