Which of the following is not true of the theory of optimum population?

• A.It is possible for densely populated country to be underpopulated if it has insufficient labour to make the most effective use of its other factors
• B.The quantity of labour which combined with the other factors gives the minimum output is known as optimum population
• C.The quantity of labour which combined with the other factors, gives the maximum output, is known as optimum population
• D.The test for over-population is whether it exceed the optimum
• E.It is possible for a thinly populated country to be over populated if it has a poor supply of other factor