单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Which of the following is CORRECT information about the size of China and its population

A.It is as big as Canada and UK.
B.It has a population of 1.3 billion.
C.Most of people are Mainly Chinese.
D.There are 56 minorities.