OFFICIAL EXPLANATIONThe given text says that. while the tariff on imported electronic goods has been doubled.
The volume of goods imported has remained unchanged. One thing that can explain this oddity is if the total volume of electronic goods sold has increased significantly so that the proportion of imported goods is less than what it was.
Option (C) says this and is the right answer.
Choice (A) says that the cost of manufacture in country A and the other countries is the same. So with a higher tariff
imported goods are costlier. So mis fails to explain why the volume of import has remained unchanged.
Choice (B) says that the quality of the domestic electronic goods is as good as the imported ones. So it fails to explain why people still buy imported ones.
Choice (C) says that me sale of electronic goods has increased 100%, that is. it has doubled. So the proportion of impeded goods to domestic goods sold has come down by half. This shows that domestic sales have increased significantly while the sale of imported goods is stagnant (because of the higher price resulting from higher tariff).
Choice (D) does not explain the sales situation in country A as it only talks of the reciprocal action of other countries.
Choice (E) could be true but it does not explain why the total sales of imported electronic goods is unchanged.
Choice (C) is the correct answer.