In the Gospel of Luke, what is the significance of Jesus' parable of the Good Samaritan in response to the question, 'Who is my neighbor?'

A It emphasizes the importance of ritual purity and adherence to religious law above all else. B It defines 'neighbor' as only those who share the same ethnicity and religious beliefs. C It broadens the definition of 'neighbor' to include anyone in need, regardless of their background or social status. D It suggests that helping others should only be done when it benefits the giver.