Answer:
E, product specification
Step-by-step explanation:
During the product specification stage of a business buying is when a product is analyzed to determine if it can be redesigned, standardized or made less expensively.
A product specification is a document that shows the information involve in the creation of a product alongside the features of the product.
Product specification is important in business buying because it gives a detailed information about the reason for manufacturing such product, its performance/expected performance as well as how the product was manufactured, which materials were used, the differences with similar products of other manufacturers, etc.
I hope this helps.