In the Parable of the Good Samaritan (Luke 10:25-37), what is the primary lesson Jesus intended to convey regarding the concept of 'neighbor'?

A One should only help those of their own religious or ethnic group. B Loving one's neighbor requires legal expertise and proper documentation. C Compassion and mercy should be extended to anyone in need, regardless of their background. D It is best to avoid dangerous situations altogether to protect oneself.