What is the main idea of conversational ballgames?

The author was explaining the differences of Japanese-style conversations and Western-style conversations, and how they sort of went back and forth with each other. The author described it as "Volleyball" or, "Tennis", where the part of the title comes in, "Ballgames". 

The correct answer is:

B) the concept that a high rate of consumption and spending are the basis for a sound economy