Explanation:

Let’s break this down:

- Option 1: government

The government is supposed to enforce Fundamental Rights, but it doesn’t “guarantee” or “protect” them on its own. It acts based on what’s written elsewhere.

- Option 2: constitution 

Here’s the thing: Fundamental Rights are written into the constitution itself. That’s the highest law of the land, so nobody—not even the government—can take them away unless the constitution changes.

- Option 3: customs or usage

Tradition and customs can shape society, but they’re not law. They can’t officially guarantee your rights.

- Option 4: panchayats

Panchayats are local governing bodies. They have some power, sure, but nothing close to constitutional authority.

Bottom line: the constitution is what protects and guarantees Fundamental Rights.