The correct answer is option 'B', which is the Supreme Court. The Supreme Court acts as the guardian of Fundamental Rights in India. It plays a crucial role in upholding and protecting the rights of citizens guaranteed by the Constitution.

Role of the Supreme Court as the guardian of Fundamental Rights:

1. Interpretation of the Constitution: The Supreme Court is responsible for interpreting the provisions of the Constitution, including Fundamental Rights. It ensures that the rights and freedoms guaranteed by the Constitution are given their due importance and are not violated by any laws or actions.

2. Judicial Review: The Supreme Court has the power of judicial review, which allows it to review the constitutionality of laws and executive actions. It can strike down any law or action that is found to be in violation of Fundamental Rights. This power acts as a check on the legislative and executive branches of the government and ensures the protection of citizens' rights.

3. Enforcement of Fundamental Rights: The Supreme Court has the authority to enforce Fundamental Rights. It can issue writs, such as habeas corpus, mandamus, prohibition, certiorari, and quo warranto, to protect the rights of individuals. These writs are powerful tools for safeguarding the rights of citizens and ensuring that they are not infringed upon.

4. Public Interest Litigation (PIL): The Supreme Court has expanded the scope of PIL, allowing individuals and organizations to file petitions on behalf of those whose Fundamental Rights are violated. This has made it easier for citizens to seek justice and protection of their rights.

5. Appointment of Judges: The Supreme Court is involved in the appointment of judges to the High Courts and itself. The selection process ensures that competent and impartial judges are appointed, which is crucial for the effective protection of Fundamental Rights.

6. Guidance to the Government: The Supreme Court provides guidance to the government on matters related to Fundamental Rights. It can issue directions and guidelines to ensure that the government acts in accordance with the Constitution and respects citizens' rights.

Conclusion:

The Supreme Court's role as the guardian of Fundamental Rights is of utmost importance in a democratic country like India. It ensures that citizens' rights are protected, and the government's actions are in line with the principles of justice, liberty, equality, and fraternity enshrined in the Constitution. Through its interpretation, judicial review, enforcement, and guidance, the Supreme Court acts as a bulwark against any infringement on Fundamental Rights.