Answer:
The answer is option a. Pope Gregory the Great.
Explanation:
Pope Gregory the great was the Pope of the Catholic Church between 590 to 604 AD. He was declared after the death of Pope Pelagius II, who reigned from 579 to 590. Pope Pelagius II chose Gregory to serve as an ambassador to the imperial court in Constantinople.
Pope Gregory the Great was known for his emphasis on missionary work. He also emphasized service to the poor for deacons and made several changes to mass notably the position of Our Father in the mass. He was also known to give alms to the poor.
He established "cantus planus" meaning plain chant in English. This style is known by many as Gregorian chants today. This melodious monophonic chant is known throughout the Church and is associated with medieval monasteries.
It would be all of them but b and c are the best answers because Fossils show the evolution of their related species or organisms
