The second one: a man of much learning is not essential is an additional characteristic of the pastor so it’s right to put it between commas. Divinity must be written uppercase since it’s the name of the school and not an adjective I think
-Salutation
In the format of informal letter yours affectionately' is termed as Salutation.
Metaphor- a figure of speech in which a word or phrase is applied to an object or action to which it is not literally applicable.
D is best author claim becuse it states the argument