Concept:Christian giving is a grateful response to God's goodness, not a way to earn salvation or heaven.Explanation:Scripture teaches that God first blessed believers, so giving is an act of love and thankfulness.Passages like 2 Corinthians 8–9 show giving as a response to God's grace.Therefore, the main motive behind Christian giving is to reciprocate God's blessing.Answer:B. reciprocate God's blessing