Mechanical solidarity is observed in traditional societies where there is a simple division of labour based on resemblances. In this type of order and solidarity, collective consciousness and collective identity are more powerful and dominant than individual consciousness and identities. Organic solidarity is observed in modern societies where there is a complex division of labour based on social differentiation. Durkheim states that increasing social differentiation in developed societies depending on social division of labour leads to a new social order from mechanical solidarity to an organic one. The correct answer is C.