As a general principle of economics it is said that growth is a function of investment. But to sustain growth it is not enough that country has a high investment rate only. It is also needed that investment has to be---

A

exactly the same year after year and at least for the period of five years

B

rising year after year and that too for many years

C

down after a period of two/three years

D

withdrawn after a period of three years so that the growth can be spread uniformly

E

None of these