Zimmer Centralpulse Is the World's Largest Producer of Replacement Hips

Zimmer Centralpulse is the world's largest producer of replacement hips and knees for orthopedic surgery.It is particularly interested in marketing in the southwestern United States,where a large aging population lives.Which external environmental element most directly explains its continued growth?

A) economic conditions
B) political conditions
C) culture
D) demography
E) social forces