Federalism, separation of powers, and checks and balances are constitutional principles that directly A) empower more voters
B) restrict individual liberties
C) involve citizens in the governing process
D)reduce the concentration of governmental power

D) reduce the concentration of governmental power

Explanation:

The constitutional principles above make sure that power will not be concentrated only in a single entity thus, they provided checks and balances in order to ensure "justice" in the government.

The "separation of powers" allows the different branches (Legislative, Executive and Judicial) in the government to exercise their authority over different fields. This will prevent one branch from becoming more powerful than the other.

With "federalism," power is being dispersed among the different states and other governing bodies. This makes sure that people are able to share in the national power in order to have a united country.

federal power is further limited with a system of checks and balances that gives each branch of government a measure of power over the others.

explanation:

the united states began searching for a way to reduce oil

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