The correct answer is option 'C': Social conditions were not yet ripe for their ideas to flourish.

Explanation:

The Derozians, also known as the Young Bengal movement, were a group of radical thinkers during the early 19th century in Bengal, India. They were inspired by the ideas of the European Enlightenment and aimed to bring about social and cultural reforms in India. However, despite their rational thinking, attack on old customs, and love for liberty and equality, they could not succeed in creating a significant movement. The reasons behind their failure can be attributed to the social conditions prevailing at that time.

1. Conservative Society:
During the early 19th century, Indian society was largely conservative and deeply rooted in traditional customs and beliefs. The Derozians, with their progressive ideas, faced strong opposition from the orthodox sections of society. The majority of people were not ready to accept their radical ideas, making it difficult for the movement to gain traction.

2. Lack of Mass Support:
The Derozians were mostly intellectuals and students from the Hindu College in Calcutta. While they were able to generate intellectual discussions and debates within their limited circle, they failed to garner mass support for their ideas. The movement lacked a broader base and failed to resonate with the general population.

3. Limited Influence:
The Derozians were condemned by both the British authorities and many Indians. The British saw them as a threat to their rule and suppressed their activities. On the other hand, many Indians viewed them as too radical and disruptive to the existing social order. This dual opposition limited their influence and hindered the growth of their movement.

4. Absence of Effective Leadership:
After the death of their leader H.V. Derozio in 1831, the movement lacked effective leadership. Derozio was a charismatic figure who inspired and guided the members of the Young Bengal movement. His demise left a void that was not successfully filled by any other leader. The absence of a strong leader weakened the movement and prevented it from gaining momentum.

In conclusion, the Derozians were unable to create a successful movement due to the social conditions of the time. The conservative nature of Indian society, lack of mass support, opposition from both the British and Indians, and absence of effective leadership were the key factors that hindered their progress. While their ideas were ahead of their time, it took several more decades for society to become more receptive to their progressive ideals.