Concept:The key idea is that James describes the prayer of a righteous person as having real spiritual force and practical effect.
Explanation:James 5:16 instructs believers to confess their sins and pray for one another so that healing can take place.
In that same verse, James declares that the prayer of a righteous man is not empty or weak.
The original text says such a prayer is "powerful and effective" because it is backed by a righteous life.
This shows that God responds to the earnest prayers of those who live uprightly.
Therefore, option A gives the exact meaning James intended: the prayer is powerful and effective.
Answer:A. powerful and effective