Cooper Copper,a Manufacturer of Copper Piping,buys Copper on Credit on March

Cooper Copper,a manufacturer of copper piping,buys copper on credit on March 10.It processes this copper to make pipes on March 25 and pays cash for the copper on April 9.On April 14 it sells the pipes to a construction company,and on May 14 receives cash payment for this sale.What is the length of the cash cycle in this case?

A) 15 days
B) 20 days
C) 65 days
D) 30 days
E) 35 days