If a Business Enhances the Quality of a Product, Makes

If a business enhances the quality of a product, makes it more convenient to use, improves its durability, or makes it more up-to-date, any one of those initiatives fall under the category of ________.

A) increasing the market penetration of an existing product or service
B) extending product lines
C) geographic expansion
D) licensing
E) improving an existing product or service