Final answer:
The new rulers executed the old empress's relatives to get rid of them. Hence the correct answer is option 3
Step-by-step explanation:
The new rulers got rid of the old empress's relatives by executing them. When Empress Lü died, her opponents killed almost all her relatives. In the Han dynasty, the clan that lost a bid to provide the empress might be exterminated. The new rulers used violence to eliminate any potential threats from the old empress's relatives.
Hence the correct answer is option 3