Concept:Labour efficiency depends on workers’ skills, health, motivation, and the quality of other production inputs, not on their race or colour.
Explanation:Education and training improve the skill and productivity of workers.
Provision of welfare services improves workers’ health, morale, and commitment.
Quality of other factor inputs affects how effectively labour can be used.
Race and colour of the workforce have no direct economic effect on the ability or output of labour.
Therefore, race and colour do not affect the efficiency of labour.
Answer:C. Race and colour of workforce