Why did Chinese believe the Tang struggled with crop failures and government problems?

a They had lost the Mandate of Heaven.

b They had poor agricultural practices.

c They were disorganized and lazy.

d They were corrupt and evil men.

Okay then this is from two years ago, interesting

The answer is letter A. Because of the belief of the Chinese of the Mandate of Heaven, their emperor was not able to boost their economic as well as the continuous problems in government. The Tang Dynasty decided to merge with Emperor Gaozu to improve the economic and political sectors during the Tang dynasty