It is an Ottonian manuscript. It <span>produced magnificent medieval illuminated manuscripts and it is about religion. They were a major art form of the time, and monasteries received direct sponsorship from emperors and bishops, having the best in equipment and talent available. The range of heavily illuminated texts was very largely restricted (unlike in the </span>Carolingian Renaissance) to the main liturgical books, with very few secular works being so treated.
I think the answer is A, to serve in religious and political rituals.
Christian art is generally created as an expression of what the church may believe. Since there are several different types of Christianity, or branches under the large name, the church the artist goes to, or whatever religious ideas the artist has will be portrayed in his artwork. Christian art is made to support their ideas and religion, as well as give people a sort of image to look up to. After all, nobody truly knows how God looks.