Why were St. Sernin in Toulouse, France, and Santiago de Compostela in Spain pilgrimage churches in the eleventh century?

a) They both housed relics of Christian saints that the faithful hoped would help fulfill their prayers.
b) Peasants reported seeing visions of the Virgin Mary at both sites.
c) Healing springs that were said to cure the sick were discovered near both churches.
d) They were both adorned with famous frescoes.

Answer: a