How does the new testament of the christian Bible differ from the Old Testament

The old testament is a primarily Jewish collection of documents, detailing the history of the Jewish people and their respective mythologies, laws, and military conquests. Many sections are extremely old, and it is highly valued for its insight into ancient near-eastern religion and culture.

The new testament, however, is a much newer product of individuals in the first century AD, after the death of Jesus. They are primarily letters written by followers of Jesus Christ and his disciples, to churches and communities that they set up as the traveled the region spreading the news of this very young religion (Christianity). These letters are almost entirely focused on the message of Jesus, converting people into this new religion, and explaining how adherents should act in accordance with the philosophies of Jesus

Explanation:

the answer is b for brother