Step 1: Understanding the concept.
The division of labour allows workers to focus on specific tasks, thus increasing their efficiency and productivity. Specialisation is the process where workers become highly skilled in a specific task, leading to better performance and output.
Step 2: Analyzing the options.
• (A) Rotation: Incorrect. Rotation of tasks doesn't necessarily increase productivity, as workers may lack expertise in each task.
• (B) Motivation: Incorrect. While motivation is important, it is not the primary factor here.
• (C) Mechanisation: Incorrect. Mechanisation involves the use of machines, but it is not the focus of this question.
• (D) Specialisation: Correct. Specialisation of tasks leads to higher productivity as workers become more skilled in their specific roles.
Step 3: Conclusion.
The correct answer is (D) Specialisation.
Final Answer: (D) Specialisation.