Concept:The labour supply curve shows how the quantity of labour supplied changes with the wage rate.
Explanation:At lower wage rates, an increase in wages encourages workers to supply more labour.
So the supply curve slopes upward initially.
However, at very high wage rates, workers begin to value leisure time more than additional income.
They prefer to work fewer hours even if wages rise further.
As a result, the quantity of labour supplied falls after a certain wage level.
This makes the labour supply curve bend backwards.
Answer:C. backward bending supply curve