How Can We Differentiate On How Something Can Contribute Positiviely To The Coun

How can we differentiate on how something can contribute positiviely to the country in terms of a) balance of merchandise trade and b) balance on trade of gooods and devices. Will a) and b) have different or same outcomes. Refer to the pictures below and explain why other options can’t be the befitting answer ?

* Attachment 1
* Attachment 2