In the parable of the Good Samaritan (Luke 10:25-37), what key aspect of the Samaritan's actions challenged the prevailing social and religious norms of the time?

A His knowledge of Jewish law and traditions. B His willingness to offer financial assistance to a stranger. C His disregard for the potential danger to himself in helping the injured man, despite the existing animosity between Samaritans and Jews. D His expectation of receiving recognition and reward for his good deed.