James said that Abraham, by agreeing to sacrifice Isaac was justified, as a beli...

The question is asking which quality of Abraham justified his agreement to sacrifice his son Isaac. James, most likely a biblical character, said that Abraham was justified as a believer by this quality. The options are faith, truthfulness, work, and loyalty.

In the Bible, Abraham is known as the father of faith. He demonstrated great faith in God by agreeing to sacrifice his son Isaac, as God had commanded him. Even though it was a difficult task, Abraham trusted in God's plan and believed that God would provide a way out. This act of faith is why option A - faith - is the correct answer to the question.

Faith is an essential aspect of Christianity. It is the belief in God and His promises, even when things may not make sense or seem impossible. Abraham's faith in God is a model for Christians to follow. Christians can strengthen their faith through prayer, reading the Bible, attending church, and surrounding themselves with other believers.

To learn more about faith in Christianity, please read the relevant sections of the recommended textbooks.