Which of the following statements accurately describes China’s relationship with Mongolia?

A) Mongolia gained its independence from China in 1911 following the overthrow of the Qing dynasty and, despite being a communist nation until 1911, has maintained its independence from China.
B) Mongolia is communist nation like China, but they disagree with the current leadership of the Chinese Communist Party under Xi Jinping, which has stymied attempts at reunification.
C) Mongolia has been a sovereign, independent nation since the collapse of Mongol Empire but wishes to become part of China for the perceived economic and military advantages.