AMPM is a reputed wristwatch company. Foreseeing the changing trend, the management of the company decided to manufacture smartwatches. This feature of management suggests that:

The correct option is: Management is a dynamic function

Here is a step-by-step explanation of why this option is correct:

1. Understanding the Business Environment:
The business environment is constantly changing due to technological advancements, shifting consumer preferences, and competitive pressures. In this scenario, AMPM, a traditional wristwatch manufacturer, recognizes a "changing trend" in the market—specifically, the shift in consumer demand from traditional wristwatches to smartwatches.

2. Adapting to Change:
To survive and grow, a business must adapt its goals, products, and strategies to align with these environmental changes. By deciding to manufacture smartwatches, AMPM’s management is proactively modifying its product line in response to the evolving market and technological landscape.

3. Defining "Dynamic Function":
In principles of management, saying management is a "dynamic function" means that it is not static; it must constantly adapt, change, and reinvent its operations, goals, and policies according to the external environment. AMPM's decision to shift from traditional wristwatches to smartwatches is a classic demonstration of this dynamic adaptability.

4. Why other options do not fit:
- Management is all pervasive: This means management is required in all types of organizations (economic, social, or political) and at all levels, which is not the primary focus here.
- Management is a continuous function: This refers to management being an ongoing series of interrelated functions (planning, organizing, directing, etc.) rather than a one-time activity.
- Management is an intangible force: This means management cannot be seen physically, but its presence can be felt through orderliness and target achievement.