**The reasoning**
Constitutional supremacy is a foundational principle in law and government. It means the **Constitution stands above everyone and everything** — no person, institution, or law can override it.
Think of it like this: In a football match, the referee's rulebook is supreme. Players, coaches, even team owners must follow those rules. Similarly, in a country, the Constitution is the "rulebook" that binds the President, legislators, judges, police, army — everyone. Any law or action that contradicts the Constitution is **invalid**. This protects citizens' rights and prevents dictatorship.
**Why the wrong options tempt you**
**A (Police is supreme)** — In practice, police enforce laws, so students might confuse enforcement power with legal authority. But police must still obey the Constitution.
**C (Army leads)** — In military regimes, armies *do* rule, but that's **unconstitutional**. Don't confuse what sometimes happens with what's legally correct.
**D (Schools rule)** — Obviously wrong, but included to test if you're guessing randomly.
**Quick takeaway**
Constitutional supremacy = **The Constitution is the boss of everyone, including government**. No one is above it.