Correct Option: C. Ephesians Detailed Explanation: The concept of 'New Life in Christ' is a central theme in the New Testament, particularly in the writings of the Apostle Paul. Among the options provided, the Epistle to the Ephesians is the one where Paul extensively discusses this theme.

1. Context of Ephesians:
2. The Epistle to the Ephesians is a letter written by Paul to the Christian community in Ephesus. It addresses various aspects of Christian doctrine and practice, emphasizing the transformative power of faith in Jesus Christ.
3. In Ephesians, Paul elaborates on the idea that believers are made new through their faith in Christ, which is a fundamental aspect of Christian theology.
4. Key Passages:
5. Ephesians 2:1-10: This passage is particularly significant as it describes how believers were once dead in their sins but have been made alive in Christ. Paul emphasizes that salvation is a gift from God, not a result of works, highlighting the grace that brings about this 'new life.'
6. Ephesians 4:22-24: Here, Paul instructs believers to put off their old self and to be renewed in the spirit of their minds, putting on the new self created to be like God in true righteousness and holiness. This directly ties into the concept of living a new life in Christ.
7. Theological Implications:
8. The 'New Life in Christ' signifies a radical transformation that occurs when one accepts Jesus as Lord and Savior. It involves a change in identity, purpose, and behavior, which Paul articulates throughout Ephesians.
9. Paul’s teachings in Ephesians encourage believers to live in a manner that reflects their new identity, emphasizing unity, love, and moral living as expressions of this new life.

Why Other Options Are Incorrect:

• A. Acts of the Apostles:
• While Acts describes the early church and the spread of the Gospel, it does not focus on the theological implications of 'New Life in Christ' as extensively as Ephesians. Acts is more narrative in nature, detailing events rather than theological teachings.
• B. Revelation:
• The Book of Revelation is primarily apocalyptic literature that deals with visions of the end times, judgment, and the ultimate victory of Christ. It does not focus on the concept of 'New Life in Christ' in the same way that Ephesians does.
• D. Corinthians:
• The letters to the Corinthians (1 and 2 Corinthians) do address issues of moral behavior and the implications of being in Christ, but they do not provide as comprehensive a discussion on the theme of 'New Life in Christ' as Ephesians does. Instead, they focus more on church issues, divisions, and ethical conduct.

Revision Summary:

• The Epistle to the Ephesians is where Paul extensively discusses the concept of 'New Life in Christ.'
• Key passages include Ephesians 2:1-10 and Ephesians 4:22-24, which highlight transformation and renewal.
• Other options (Acts, Revelation, Corinthians) do not focus on this theme as comprehensively as Ephesians.
• Understanding the 'New Life in Christ' is crucial for grasping the transformative nature of Christian faith according to Paul.