Pendleton Woolen Mills makes bright plaid-design woolen shirts for men and skirts, sweaters, blouses and jackets for women in similar patterns. Pendleton buys wool from farmers, sorts, grades and cleans the fibers, and then spins it into yard. It then weaves this yarn into fabric that it uses to make its clothing. Pendleton uses:
A. backward buying
B. Horizontal Integration
C. Direct Distribution
D. Vertical Integration
E. A product-oriented distribution channel