Step 1: Constitutional Parts related to Rights 
- Part III of the Indian Constitution deals with Fundamental Rights, which guarantee civil liberties to individuals to protect them from arbitrary state action. 
- Part IV deals with Directive Principles of State Policy (non-justiciable guidelines). 
- Part V and VI deal with Union and State Governments respectively. 
Step 2: Importance 
Fundamental Rights are essential for safeguarding democracy and individual freedoms in India. 
Therefore, the correct answer is Part III of the Constitution.