In your own words, give a brief explanation of how the New Testament came to be.

The New Testament came to be from God. The disciples who followed him or heard of him for others wrote down his stories.

The New Testament came to be through God the father. But it seems it was very important that the writers of the New Testament had a connection to Jesus and the early church. Later works, like Thomas, did not meet the criteria, like that connection and were therefore left out.

It would seem that the gospels and letters, of utmost importance to the early believers, would have been loviingly and painstakingly copied, passed on verbally, and possibly memorized much as we do today. As the second generation of believers led the church they also had to deal with false teachers and false teachings. So they would meet together to pray and discuss what people were hearing, and they would have used what they had already copied or knew from verbal teaching or prophecies from the Old Testament to continue to teach the truth in the church.

The New Testament came to be through revelation from God and by the leading of the Holy Spirit. The forming of the New Testament came through careful consideration of the validity of each account.

The New Testament came to be through God. Jesus’s disciples and their followers were inspired by God to write down the new covenant between man and God that Jesus created.

John 14:25-26
25 “All this I have spoken while still with you. 26 But the Advocate, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you.”
While the acceptance of the 27 books of the New Testament by man has been described within the lesson as involving a rigorous process of authentification, it is my contention that the New Testament came to be through the will of God. Jesus instructed his disciples to carry forward with his teachings.
2 Peter 1:21 “For prophecy never had its origin in the human will, but prophets, though human, spoke from God as they were carried along by the Holy Spirit.”
This is how the New Testament came to be.
Convening councils and setting out criteria for the acceptance of writings, this is just man being man. The Word is the Word.