Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
The culture of Vietnam is one of the oldest in the Southeast Asia region. Although Vietnam lies geographically in the Southeast Asia, long periods of Chinese domination and influence has resulted in the emergence of many East Asian characteristics in Vietnamese culture, and generally Vietnam is said to be a part of the East Asian cultural sphere, known widely as Chinese cultural sphere.
Despite considerable foreign influence, Vietnamese people have managed to retain many distinct customs. While Chinese culture has the largest influence on traditional Vietnamese culture, there is also a much smaller influence from the Cham and later Western cultures, most notably of France, Russia, and the United States.
In term of prehistory, most Vietnamese historians consider the ancient Dong Son Culture to be one of the defining aspects of early Vietnamese civilization.
Vietnam’s population is 2006 was 84,402,966, with a population density of 253 people per km$^2$. Most people live in or near the densely populous Red River or Mekong deltas.
Due to the nation’s southward expansion throughout its history, along with the different climate and environment met by their settlers as they moved further south, slightly different regional cultures began to emerge, most notably between Northern and Southern Vietnam.
(2.5 points) The culture of Vietnam ________________.