What does the Apostle Paul mean by the 'inner man' in Romans 7:22 and Ephesians 3:16?

A The 'inner man' refers to the part of a person that delights in God's law and is renewed by the Holy Spirit. B The 'inner man' is the immortal soul, as understood in Hellenistic philosophy. C The 'inner man' is purely a metaphor for the physical heart and mind working together. D The 'inner man' is a reference to the ancient Jewish understanding of the soul.