(c) America
The United States of America is an example of a two-party system, where only two main parties have a serious chance of winning majority of seats to form the government.
Source: How many parties should we have?, Chapter 4
The passage explicitly states: "The United States of America and the United Kingdom are examples of two-party system." China has a one-party system (Communist Party), India has a multiparty system, and Russia is not mentioned as a two-party system. Always recall the key examples given in the textbook for each type of party system.