In the Parable of the Good Samaritan (Luke 10:25-37), what detail emphasizes the radical nature of the Samaritan's compassion, considering the historical and social context?

A The Samaritan was wealthy and could easily afford to help. B The Samaritan was traveling on a well-known and safe road. C The Samaritan belonged to a group despised and rejected by the Jews, making his act of kindness unexpected and challenging societal norms. D The Samaritan was a trained medical professional.