Which choice is an example of our system of checks and balances at work?

The president vetoes or refuses to sign a law that he does not agree with.

Explanation:

Checks and balances refers to a system whereby a branch of a government can make amendment or veto the acts of other branch in order to curtail one branch from having too much power.

In this case, the president who is a member of the executive branch can vetoes or refuses to sign a law that he does not agree with. Therefore, the correct option is C.

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