Avon was known as the company that sold cosmetics door-to-door for a long time. In order to grow and reach new markets it began to sell jewelry through its door-to-door sales force. This involved marketing new products through existing channels of distribution. It also is now selling its products by mail order and has opened retail stores. Avon is an example of a company effectively using which strategy?

A. product development strategy
B. diversification strategy
C. market penetration strategy