The correct answer is C.
In the Middle Age the church authorities encouraged faithful people to make pilgramage to special holly sites, claiming that by praying at those place forgiveness for sins would be obtained. Some of these holly places were churches and monasteries were bones, teeth or clothes from Christian saints were kept. These objects were called relics.
One of the most famous pilgrimage routes in Europe is the Way to Santiago de Compostela, in Spain, as its cathedral stores the rests of Apostle Santiago.
