Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

Country A has experienced a sustained trade deficit for years, then the government plan to improve the current account by depreciating its currency. According to Marshal-Lerner Condition, Country A would be able to improve it under which of the following situations?
Option A:Import goods have close substitutes.
Option B:Export goods are mostly necessities.
Option C:Import goods represent a small portion of expenditures.

Answer: A