Which type of resource is most appropriate to use to prepare research for a formal discussion?
o
an academic source
an entertainment source
a popular source
a subjective source
o

I think subjective source is the most appropriate because it is related to subject.

The correct option would be A, Academic Source

Explanation:

Academic resource is most appropriate to use to prepare research for a formal discussion. An academic source is anything which include a book, experts reports, academic articles, research papers, academic journals, etc. Academic sources are called the scholarly sources because they are double checked and reviewed by the experts in order to make sure the accuracy and quality before being published. So if you are going to engage in a formal discussion, then you must use the academic source to be sure about the topic which you are going to discuss.

b) the confederacy had to pay all union war expenses.