Which of the following books is classified as a Prison Epistle?

The classification of Ephesians as a Prison Epistle is based on its authorship and the context in which it was written. The term "Prison Epistle" refers to a group of letters attributed to the Apostle Paul that he wrote while imprisoned, traditionally during his house arrest in Rome. Ephesians is one of these letters, along with Philippians, Colossians, and Philemon.

In Ephesians, Paul addresses key theological themes such as the nature of the church, unity among believers, and the implications of living a Christian life. This context of imprisonment highlights the significance of the message Paul conveys, as he writes to encourage and strengthen the faith of the church while facing personal challenges.

The other options listed—Romans, 1 Corinthians, and Hebrews—do not fit into this classification. Romans and 1 Corinthians are letters written to specific churches addressing various doctrinal and practical issues, but they were penned during periods when Paul was not in prison. Hebrews, while it holds significant theological content, is of uncertain authorship and context and does not fall into the category of Pauline letters written during imprisonment. Thus, Ephesians stands out clearly as a Prison Epistle among the choices provided.