Under What Circumstances Would It Be Less Likely That a Double

Multiple Choice

Under what circumstances would it be less likely that a double coincidence of wants exists and the more likely that a monetary exchange will develop?  

A)  the fewer the number of goods available in an economy 
B)  the greater the number of goods available in an economy 
C)  when are no goods are available in an economy 
D)  when individuals are producing only the goods they want to consume