Japan Has More Vending Machines Per Capita Than Any Other

Multiple Choice

Japan has more vending machines per capita than any other country in the world.One explanation for this phenomenon is that

A) vending machines are expensive in Japan
B) the Japanese sales clerks' union requires that vending machines be used wherever possible
C) labor is scarce in Japan, and vending machines help conserve on labor
D) labor is abundant in Japan, and vending machines help conserve on labor
E) vending machines were invented in Japan