Brilliant Balloons,a Party Balloon Manufacturer,buys Latex on Credit on September

Brilliant Balloons,a party balloon manufacturer,buys latex on credit on September 1.It processes this latex to make balloons on September 6 and pays cash for the latex on September 14.On September 19 it sells the balloons to a party supply retailer,and on October 5 receives cash payment for this sale.What is the length of the operating cycle in this case?

A) 21 days
B) 5 days
C) 18 days
D) 34 days
E) 13 days