A new specialty spice shop opened up in town. In order to lure customers into the store, the owners sent a packet of its most popular spice mix to 3,000 potential customers. This is an example of

A) an allowance.
B) a sample.
C) a rebate.
D) a coupon.
E) a loyalty program.

A quantity standard indicates how much of an input should be used to make a unit of product or provide a unit of service.