The Hallmark Company Was Inspired by the Popularity of Jan

The Hallmark Company was inspired by the popularity of Jan Karon's best-selling novels about Mitford,a fictional town in the mountains of North Carolina,to develop a new line of products for Hallmark Gold Crown Stores nationwide.Hallmark created hundreds of Mitford-inspired products that authentically bring "the little town with the big heart" into tangible reality.The products include greeting cards,partyware and gift wrap,mugs,and puzzles for Hallmark's existing customers.Hallmark used a _____ strategy.

A) market development
B) market penetration
C) product penetration
D) product development
E) diversification