Which of the following is not a key change in the business environment since the 1970s?

A) Greater demand for high-quality goods and services
B) More highly educated workers
C) Greater stability in consumer tastes and preferences
D) Increased sophistication of technology

Greater stability in consumer tastes and preferences is not a key change in the business environment since the 1970s. The other options are all key changes: there is a greater demand for high-quality goods and services, more highly educated workers, and increased sophistication of technology. However, consumer tastes and preferences can still change and evolve over time, leading to changes in the business environment.