In the Parable of the Good Samaritan (Luke 10:25-37), what is the most significant aspect of the Samaritan's actions that Jesus emphasizes to the lawyer?

A His adherence to the Mosaic Law regarding purity and contact with foreigners. B His financial generosity in covering the injured man's medical expenses. C His demonstration of compassion and practical help, transcending ethnic and religious boundaries, thus fulfilling the command to 'love your neighbor as yourself'. D His social status as a Samaritan, considered an outcast by the Jewish community.