What is the tone Nick conveys about Tom? About the Buchanans' house

Which best expresses the irony present in this passage?

Identify the homophone pair that needs to be corrected in these sentence

The major difference between the communist party in china and political parties in the united states is that a. in the united states, political parties have no role in government. b. in china, the communist party shares power with the national people's congress. c. in the united states, political parties hold widely differing views on almost every topic. d. in china, the communist party runs the government with no opposition.