Step 1: Understanding the question.
The question asks about the factors that influence managerial behaviour and practices.
Step 2: Analyzing the options.
- Organisational Objectives: These are important for guiding the organisation but do not directly influence managerial behaviour and practices.
- Principles of Management: The principles of management provide guidelines and frameworks that influence managerial behaviour and practices.
- Leadership Traits: Leadership traits influence leadership styles but are not as broad as the principles of management in affecting all managerial practices.
- Dimensions of business environment: These influence the overall environment but not directly managerial behaviour or practices. Step 3: Conclusion.
The correct answer is Principles of Management, as they directly provide insights into managerial practices. Final Answer:
\[
\boxed{\text{The correct answer is (2) Principles of Management.}}
\]