Which of the following statement is NOT one of the reasons for that Mandarin is used in China？

A、Because Mandarin is standardized and is the legal national language of China.
B、Because Beijing is China's political, and Beijing dialect was spread throughout the country, then became "Mandarin".
C、Because the influence of Beijing dialect has gradually increased and its status has become increasingly important.
D、Because Mandarin is used in most countries.