In the book of Acts, what is the significance of the story of Philip and the Ethiopian eunuch (Acts 8:26-40) beyond a simple conversion narrative?

A It primarily highlights Philip's superior knowledge of scripture compared to the Ethiopian eunuch. B It primarily demonstrates the Ethiopian eunuch's high social standing and wealth. C It showcases the early church's expansion beyond its Jewish origins, emphasizing the inclusion of marginalized groups (a Gentile, a eunuch) into the Christian community and fulfilling the prophetic vision of Isaiah 56 about inclusion in God's covenant. D It primarily illustrates the importance of baptism by immersion as the sole means of salvation.