The Following Information Pertains to Sooner Company:
May 1 $\quad$ Customer Ordered an Installation Service to Be Done by Sooner

The following information pertains to Sooner Company:
May 1 $\quad$ Customer ordered an installation service to be done by Sooner Company on May 15.
May 2 $\quad$ Customer paid cash for the installation job to be done on May 15.
May 8 $\quad$ The Sooner Company purchased installation supplies on account for the job.
May 15 $\quad$ The installation job was started and completed.
May 20 $\quad$ Amount owed for supplies purchased on May 8 is paid.
Assuming that Sooner Company uses accrual-basis accounting,when would the company record the expense related to the supplies?

A) May 2.
B) May 8.
C) May 15.
D) May 20.