"A small enterprise cannot afford to install an expensive control system". This statement refers to.

Costly Affairs

The correct answer is option (4) : Costly Affairs

"A small enterprise cannot afford to install an expensive control system" refers to :

(4) Costly Affairs

This suggests that the installation of an expensive system is considered costly for a small enterprise,  which is why they might hesitate to implement such a system due to budget constraints.

It is one of the limitation of controlling