A constitutional and traditional bulwark in our government is

The correct answer is B. the separation of powers.

The separation of powers is a fundamental principle in constitutional government, designed to prevent any one branch (executive, legislative, or judicial) from gaining too much power. This system allows for a balance of authority, ensuring that government functions effectively while protecting citizens’ rights and liberties. Each branch can check the powers of the others, serving as a bulwark against tyranny.