Answer:
The answer is: C) core competencies that have become core rigidities.
Step-by-step explanation:
Core competencies over time become core rigidities, sometimes due to new technologies and other times due to changing consumer habits or preferences. This case would be a change in consumer habits, most women no longer know how to make a dress. Most of the times core rigidities occur due to technological changes, for example Kodak's photographic paper gave them a competitive advantage until digital cameras became popular and Kodak went bankrupt. Technology has changed so rapidly that even digital cameras are no longer common, people use their smartphones now.