Concept:Efficiency of labour refers to the productive capacity of workers, determined by their quality and working environment rather than the mere size of the population.
Explanation:Efficiency of labour measures the output a worker can produce within a given period of time.
Education and training improve the skill level and knowledge of workers, thereby raising their efficiency.
Good working conditions increase morale and reduce fatigue, which leads to higher productivity.
The social attitude to work, such as punctuality, discipline, and commitment, also determines how productive labour is.
However, the total population only reflects the quantity of people available for work.
A large population does not necessarily mean greater efficiency of labour.
Efficiency is determined by the quality of the workforce and the conditions under which work is done, not simply by the number of people.
Therefore, total population is not a factor that determines the efficiency of labour.
Answer:D. Total population