Explanation:

The correct answer is option 'C' - Principles of management cannot be tested in laboratories.

Principles of Management:
Principles of management are fundamental guidelines and concepts that help managers in making decisions and achieving organizational goals. These principles are based on observations and experiences of successful managers and are widely accepted as effective and efficient ways of managing organizations.

Definition:
Principles of management can be defined as a set of guidelines or fundamental rules that guide managers in making decisions and managing organizations. These principles provide a framework for managers to effectively plan, organize, lead, and control their activities.

Application:
Principles of management can be applied anywhere, in any type of organization or industry. These principles are universal in nature and can be applied in various contexts. Whether it is a business organization, government agency, non-profit organization, or educational institution, the principles of management can be used to improve efficiency, productivity, and overall performance.

Testing in Laboratories:
Principles of management are not scientific theories that can be tested in laboratories. They are based on observations and experiences of successful managers and are more of practical guidelines rather than scientific laws. These principles are derived from real-world situations and are influenced by various factors such as organizational culture, external environment, and individual differences.

Practical Nature:
The principles of management are more practical in nature and focus on providing managers with practical guidance and tools for effective decision-making and problem-solving. They are not based on controlled experiments or laboratory testing, but rather on the accumulated wisdom and experiences of successful managers.

Conclusion:
In conclusion, principles of management cannot be tested in laboratories as they are not scientific theories. They are practical guidelines that provide managers with a framework for decision-making and managing organizations. These principles are applicable in various contexts and can be used by managers to improve organizational performance.