The correct answer is option 4, China. China is known for following a One Party System, where the Communist Party of China has been in power since 1949. In a One Party System, only one political party is allowed to exist and hold power. This means that there is no competition or alternative parties in the political system. The ruling party exercises full control over the government and decision-making processes. It is important to note that this answer is correct as of the time of writing, however, political systems and dynamics can change over time, so it is always important to stay updated with the latest information.