The correct answer is option 'C,' i.e., the title of Raja was given to Raja Ram Mohan Roy by the people of Bengal. Let's delve into the details to understand why.

**Raja Ram Mohan Roy and his contributions:**
- Raja Ram Mohan Roy was a prominent social and religious reformer during the early 19th century in India.
- He played a crucial role in the Bengal Renaissance and is often referred to as the "Father of Modern India" due to his efforts in advocating for social, educational, and political reforms.
- Raja Ram Mohan Roy was born on May 22, 1772, in Radhanagar, Bengal Presidency (present-day West Bengal, India). He belonged to a Bengali Brahmin family.

**The title of Raja:**
- Raja Ram Mohan Roy did not inherit the title of Raja or any aristocratic position. Instead, he earned it through his contributions and influence on society.
- The title "Raja" was bestowed upon him by the people of Bengal as a mark of respect and admiration for his work.
- This title signifies the high regard and recognition that Raja Ram Mohan Roy received from the Bengali community for his efforts in championing various social causes.

**Importance of the title:**
- The title of Raja was not merely a symbolic honor but also carried significant weight in Indian society.
- In traditional Indian society, the title of Raja was associated with authority, prestige, and leadership.
- By conferring the title of Raja upon Raja Ram Mohan Roy, the people of Bengal acknowledged his leadership qualities and considered him as a representative of their aspirations and interests.

**Raja Ram Mohan Roy's legacy:**
- Raja Ram Mohan Roy's contributions were not limited to Bengal but had a far-reaching impact on the entire Indian society.
- He was instrumental in eradicating social evils like Sati (the practice of widows immolating themselves on their husband's funeral pyre) and worked towards promoting women's rights, education, and religious tolerance.
- Raja Ram Mohan Roy's efforts laid the foundation for future social and political reforms in India, and his ideas continue to inspire generations.

In summary, the title of Raja was given to Raja Ram Mohan Roy by the people of Bengal as a mark of respect and recognition for his outstanding contributions to society. It signifies his leadership qualities and the impact he had on various social causes.