The correct answer is the first.
Paul’s epistles may be divided into four groups. The second group is composed by the epistles 1 Corinthians, 2 Corinthians, Galatians, and Romans.
These four epistles illustrate a new stage in the apostolic teaching. Paul points men to the cross of Christ as the only source of eternal life and gives them some doctrinal teachings since a great controversy had arisen as to the necessity of obedience to the Mosaic law because many still looked upon the Church as a subdivision of Judaism, and they saw no need to discontinue the ordinances of the law of Moses when they became members of the Christian Church.
