The correct answer is option 'D' - Neither of them.

Explanation:
Both statements are correct and accurately describe the role of the British in India during the colonial period. Let's examine each statement in detail:

1. Having decided to side with the reactionary elements of Indian society, the British withdrew support to social reforms:
- During the early years of British colonial rule in India, there were some efforts made by the British to introduce social reforms. For example, there were attempts to ban practices like sati, child marriage, and female infanticide. However, as time passed, the British started to realize that implementing social reforms would require challenging the existing social and cultural norms of Indian society.
- The British administration eventually came to the conclusion that it would be more beneficial for their rule to side with the conservative elements of Indian society rather than pushing for social reforms. This decision was driven by the desire to maintain stability and control over the Indian population.
- As a result, the British gradually withdrew their support for social reforms and started aligning themselves with the conservative forces in Indian society. This can be seen in various instances where the British supported and even encouraged practices like caste discrimination and communalism.

2. By encouraging caste and communal consciousness, the British helped the reactionary forces:
- The British recognized the divisions within Indian society, such as caste and religious differences, and exploited them to their advantage. They encouraged and manipulated these divisions to create a sense of division and animosity among the Indian population.
- The British implemented policies that favored certain communities over others, which further deepened existing divisions and conflicts. They also used divide and rule tactics, pitting different communities against each other, to maintain control and prevent the emergence of a united anti-colonial movement.
- By encouraging caste and communal consciousness, the British helped strengthen the reactionary forces in Indian society. These reactionary forces sought to maintain the status quo and resisted any progressive or reformist movements.

In conclusion, both statements accurately reflect the actions and motivations of the British colonial rule in India. The British withdrew support for social reforms and instead aligned themselves with the reactionary elements of Indian society. They also encouraged caste and communal consciousness, which further strengthened the reactionary forces. Therefore, the correct answer is option 'D' - Neither of them.