Jinggangshan revolutionary base 1927+00 opened in June, B wrong.

The Report on the Investigation of Hunan Peasant Movement was written by Chairman Mao according to his own views on the people's movement, not a reason.

Why did you choose D Northern Expedition (National Revolution)? It was very smooth before the Kuomintang launched a counter-revolutionary coup in 1927, attracting a large number of farmers to participate.