Why Did the Culture of the United States Become Dominant

Why did the culture of the United States become dominant during the late twentieth and early twenty-first centuries?

A) The populations of many nations admired the United States as the pinnacle of economic success and freedom.
B) The United States was better developed and was therefore seen as superior to all others.
C) English was the dominant international language, and the United States was successful in "marketing" its cultural output.
D) Modern cultural media such as films and popular music-and the means of spreading them, including the Internet-started in the United States and thus had the longest history there.