The correct options are
A He joined hands with the imperialists.
B He was responsible for the deaths of around 70,000 communists.
C His rule led to the Long March.
Chiang Kai-shek became the leader of the Kuomintang Party after the death of Sun-Yat-Sen. He joined hands with the imperialist forces and attacked the communists in China. He was responsible for the deaths of around 70,000 communists. To protect the communist party members, Mao Tse-Tung started the "Long March".