Concept:The power of a Christian's prayer is tied to righteous living, which demands confession and turning away from sin.
Explanation:St. James, in James 5:16, says that the fervent prayer of a righteous man avails much, meaning it has great power in its effects.
A person who continues to hold on to sin cannot claim true righteousness before God.
This is why St. James instructs believers to confess their sins to one another and to pray for one another.
The confession of sin brings cleansing, and the deliberate forsaking of sin produces a righteous life.
A righteous person, therefore, has a standing with God that makes prayer effective.
Among the options given, the command that matches James's teaching is for Christians to confess and forsake their sins.
Asking rightly, being steadfast, and having faith are also important, but they do not directly answer the point about the righteous person's powerful prayer.
Answer:A. confess and forsake their sins