Step 1: Understanding the Concept:
Business planning relies on forecasting future events. However, the external environment (economic, political, social) is "dynamic" and subject to rapid, unpredictable changes that can render existing plans obsolete.
Step 2: Detailed Explanation:
The case highlights that the business environment changed "suddenly" due to new competitors and government incentives. Because the company could not "accurately assess future trends" amidst this volatility, their plan to increase market share failed. This illustrates that planning has limitations when faced with a highly unstable or dynamic market.
Step 3: Final Answer:
The limitation discussed is (a) Planning may not work in a dynamic environment.