The answer is option d. Plain.
A significant theme in a variety of medieval writings is a pilgrimage. It happens in three main ways—as an illustration of the Christian journey through life, a real, physical journey to a sacred place, and an inward, spiritual experience—that are not mutually exclusive and frequently overlap.
A text may describe a traveler—or group of travelers—going to Rome, Jerusalem, or any other shrine, in England or abroad, for a variety of reasons, some of which are religious and others less so. Another might depict a Christian's existence from birth to death as a journey towards salvation or provide an introspective look at the development of the soul.
In some of the most significant works of this era, including Guillaume de Deguileville's Pilgrimage of the Lyfe of the Manhode, Piers Plowman and Chaucer's Canterbury Tales, external and internal journeys are intertwined.
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