Which is an example of a credible detail that supports your point in a persuasive​ proposal?
A. Established by the shipment received​ yesterday, the unit cost will be​ $1.50.
B. Based on a quick look​ around, those parts could be available soon.
C. We heard from a customer last year that the product was great.
D. We are confident that we can meet your requirements.
E. I promise the product works.