Answer: d)the nature of heaven
Step-by-step explanation:
Published in 1485 by the Catholic Priest Thomas Aquinas, the Summa Theologica aimed to act as a guide to students for them to better understand the teachings and beliefs of the Church.
Information included are; Man's purpose and virtues, How Creation happened, the life of the Christ and God, the Purpose of Angels and even has some information on the Catholic believed plain of existence known as Purgatory.
What is does not discuss however, is the Nature of Heaven.