Considering the cultural context of ancient Israel, what was the primary significance of offering the 'firstfruits' (Deuteronomy 26:1-11) beyond mere gratitude for the harvest?

A It was primarily a way to support the Levitical priesthood financially. B It served as a public declaration of allegiance to the reigning king. C It was a symbolic act of acknowledging God's ownership of the land and provision, reinforcing the covenant relationship. D It was a means of ensuring social equality by redistributing wealth to the poor.