Why was the system of checks and balances included in the constitution?

to prevent one branch of the government from becoming too powerful
to keep the president of the united states from vetoing legislation
to slow down the process of government so it doesn't move too fast

During andrew johnson’s presidency, the radical republicans gained control over policymaking in congress. they had enough power to override any presidential veto. how did the radical republicans use this opportunity? a. they blocked johnson’s weak reconstruction policies by taking charge of the reconstruction plan. b. they extended their support to johnson’s policies for reconstruction of the south. c. they removed johnson from office and took over the task of reconstructing the south. d. they removed all former confederates from office and stopped the south from rejoining the union.