A- Only small quantities of electronics from companies outside of Country S will now be sold in Country S.
No basis for statement. Maybe equal quantities maybe sold of both imported and locally manufacture electronics.
B- To take further advantage of the import tax, the national electronics company will expand its product line.
No basis.
C- Electronics have become more expensive to import not only due to the added import taxes but also due to increased transportation costs.
No mention of transportation costs in the statement.
D- Electronics are cheaper to produce outside Country S than inside Country S.
Since the taxes directly helped the company to become competitive, the difference in the price must have been an important factor. Most valid argument.
E- The national electronics company not only sells electronics products in Country S but also exports them to Country T and Country U.
No basis.
I usually go by POE - 2,3 and 5 immediately out. Out of 1 and 4, 4 makes the most sense. Hence,
D it is.