How is 'reconciliation' described by Paul in 2 Corinthians 5:18-20?

A Reconciliation involves God reconciling the world to Himself through Christ, not counting people's sins against them. B Reconciliation is achieved through strict adherence to the Mosaic Law. C Reconciliation is about individuals making sacrifices in the Temple for their sins. D Reconciliation and atonement are identical concepts with no differences.