Kauravas and Pandavas belonged to which ruling family?

Kuru

The correct answer is Option (1) - Kuru

Kauravas and Pandavas belonged to the ruling family of the KURUS.

At one level, the Mahabharata is a story about when the kinship relations changed. It describes a feud over land and power between two groups of cousins, the Kauravas and the Pandavas, who belonged to a single ruling family, that of the Kurus, a lineage dominating one of the janapadas. Ultimately, the conflict ended in a battle, in which the Pandavas emerged victorious. After that, patrilineal succession was proclaimed. While patriliny had existed prior to the composition of the epic, the central story of the Mahabharata reinforced the idea that it was valuable. Under patriliny, sons could claim the resources (including the throne in the case of kings) of their fathers when the latter died.