Answer :
Final answer:
Enos is the person who did not give a key discourse about the Atonement of Jesus Christ according to the Book of Mormon.
Explanation:
The correct answer is A. Enos.
In the Book of Mormon, Enos gives a key discourse about the Atonement of Jesus Christ. Enos speaks of his own personal experience of seeking forgiveness through faith in Christ and the mercy of God.
Amulek, Lehi, and Jacob are other figures in the Book of Mormon who also give important discourses about the Atonement, but Enos is not one of them.
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