21. Which statement best illustrates the system of checks and balances? * A. The electoral college cast 435 votes for Woodrow Wilson in 1912.
B. President Harry Truman decided to remove General Douglas MacArthur as military
commander in Korea.
C. The Senate rejected President Ronald Reagan's nomination of Robert Bork to the
Supreme Court
D. Nancy Pelosi was elected as the first female Speaker of the House of Representatives
in 2007

C. The Senate rejected President Ronald Reagan's nomination of Robert Bork to the Supreme Court

Explanation:

Given that Checks and balances is one of the principles of democratic government whereby each branch of government has the power to check the actions of the other. For example, the legislative branch of the government taking a decision that checks the actions of the executive. This is usually done to prevent the arbitrary use of power, thereby balancing the use of power.

Hence, in this case, the statement that best illustrates the system of checks and balances is "The Senate rejected President Ronald Reagan's nomination of Robert Bork to the Supreme Court"

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i hope this your understandings.

answer: (fluidity)is the correct answer.

explanation: because of this characteristic, success on the battlefield depends in large part on the ability to adapt to proactively change events to our advantage as well as to react quickly to constantly changing conditions