Answer: Country B has a more diversified economy than Country A
Explanation:
Based on the information in the question, we do not know the exports of each country. Country A, despite producing in only one market, could sell much more than any of Country B's exports.
However, Country A only produces one material, while Country B produces three. Diversity is defined as a great deal of difference or variety, and Country B shows more variety than Country A in its exports.
As such, the correct answer is "Country B has a more diversified economy than Country A."
