The correct answer is option 2: Monotheism and internal social reform.

The Kherwar or Sapha Har movement, which emerged in the 1870s, preached the idea of monotheism and advocated for internal social reform. Monotheism refers to the belief in a single, supreme deity, in contrast to polytheism which is the belief in multiple gods. The movement aimed to reject the worship of multiple gods and promote the worship of one supreme deity.

Additionally, the Kherwar or Sapha Har movement also focused on internal social reform. This suggests that the movement aimed to bring about changes within the society, possibly in terms of social customs, norms, and practices.

Option 1, which suggests acceptance of the Hindu pantheonic order, is incorrect as the movement advocated for monotheism, not the acceptance of multiple gods.

Option 3, which mentions the philosophy of Yoga and Mimansa, does not align with the ideals of the Kherwar or Sapha Har movement as there is no mention of these philosophies being preached by the movement.

Option 4, which states polytheism, is incorrect as the movement actually promoted monotheism.