Establish a business environment that promotes and rewards is the choice which the Prime Minister likely to choose.
Step-by-step explanation:
The motto here is to increase the wealth of the country.
Option 1: Invading other countries is unethical and also, it cannot assure that, Cantlivia will improve. The reason is the country which the option says is poorer than Cantlivia, so point of growth could be seen.
Option 2: Already the country economy is down, so purchasing new tools is not possible hence this option is invalid.
Option 3: We can increase wealth only by creating business and creating entrepreneurs. So this is the right choice.
Option 4: Creating a barrier will actually slow down wealth. So this option is not right.