What caused the shanghai massacre?

The Shanghai massacre of April 12, 1927, known commonly in China as the April 12 Purge or April 12 Incident, was the violent suppression of Communist Party of China (CPC) organizations in Shanghai by the military forces of Generalissimo Chiang Kai-shek and conservative factions in the Kuomintang

Explanation:

The Framers did divide the government powers between the national government and the states because dividing the government powers would prevent an abuse of power. The Framers of the Constitution were delegates to the Constitutional Convention.

The answer would be letter D.