The correct answer is option 4: One God and in breaking caste rules.

The founders of the Paramhansa Mandali, a religious group founded in Maharashtra, believed in the concept of One God and breaking caste rules. This means that they rejected the notion of multiple gods and advocated for the unity of all people regardless of their caste.

Option 1, social distancing along caste lines, is not in alignment with the beliefs of the founders of the Paramhansa Mandali. They believed in breaking caste rules rather than promoting social distancing based on caste.

Option 2, glorification of the caste system, also contradicts the beliefs of the founders. They aimed to overcome the caste system and the divisions it created, rather than glorifying it.

Option 3, forbidding widow remarriage, is not relevant to the beliefs of the Paramhansa Mandali. Their focus was on the concept of One God and challenging the caste system, not on widow remarriage.

Therefore, the option 4: One God and in breaking caste rules represents the belief system of the founders of the Paramhansa Mandali.