Nature, origin, purpose for A level history Source on Orderic Vitalis?

Hi all, I'm attempting some A level history papers (Edexcel, Anglo-Saxon topic), and I have no idea what to say for the source, other than it was written in retrospect and so could get a more rounded perspective. The Mark Scheme's 2 other suggestions are not very convincing:
• Orderic Vitalis wrote his Ecclesiastical History based on information that he received whilst residing in his monastery.
• The content and tone of the source indicates that Orderic Vitalis supported William’s reforms and admired his achievements in reforming the Church.
(https://cdn.savemyexams.co.uk/uploads/2023/01/9hi0-2a-rms-20211216.pdf). What else could I say about the Nature, origin and purpose of this source?

Here is the Source:

**Source 1: From Orderic Vitalis, Ecclesiastical History, written in the years 1110–42. Orderic Vitalis was an Anglo-Norman monk born in England in 1075. He wrote the Ecclesiastical History on the order of his superiors in his Norman monastery.**

King William was justly admired for his enthusiasm for reform. He always loved true religion in churchmen, because the peace and prosperity of the world depended on this. Whenever a bishop or abbot died, and the church was mourning the loss of its leader, this devout King sent competent officials to the bereaved house and had all the church property recorded to prevent it from being stolen. Then, he summoned his bishops and abbots and other good counsellors. With their advice, he tried to find the man most capable of governing the house of God in both spiritual and earthly matters. Finally, the wise King appointed the churchman who seemed, to his highest counsellors, to be especially distinguished in life and doctrine to become administrator and ruler of the abbey or bishopric. The King followed this course for all the years that he ruled the kingdom of England, and so left a virtuous example for others to follow. The heresy of simony was detestable to the King. In appointing abbots or bishops, King William gave less weight to wealth and power than to wisdom and a good life. He appointed abbots of known virtue to the English monasteries. By the enthusiasm and discipline of these abbots, monastic life, which for a time had been lenient and faltering, revived and was restored to its former strength.