The correct answer is Xi Jinping. As of the current global political landscape and information available, Xi Jinping serves as the President of the People's Republic of China. He also holds the influential position of General Secretary of the Communist Party of China and Chairman of the Central Military Commission. He has been the paramount leader of China since 2012-2013, solidifying his role as the head of state, party, and military.
Option A, Lee Ting, is incorrect. There is no prominent political figure by this name currently or historically known to have held the presidency of China. This name does not correspond to a Chinese head of state.
Option B, Sun Yat-sen, is incorrect. Sun Yat-sen was a highly influential revolutionary leader often referred to as the "Father of the Nation" for his pivotal role in overthrowing the Qing dynasty and founding the Republic of China. However, he passed away in 1925 and is not the current president.
Option D, Li Xianyang, is incorrect. Li Xianyang is not a recognized name of a current or former President of the People's Republic of China. This name does not appear in official records of Chinese leadership.