Lauren Is a Concert Promoter Who Works for Pop Star

Lauren is a concert promoter who works for pop star Justin Timberlake.She works very hard to make sure most of Justin's concerts are sold out because she understands the concept of perishability,which means

A) because the concert is not tangible,customers will have a difficult time judging its quality in advance.
B) the production of the concert and the consumption of the concert by the fans cannot be separated so tickets must be sold.
C) a high level of interaction will exist between the customers and the musicians,which makes the customers' presence necessary.
D) that if the tickets are not sold,seats will remain empty and they can never be sold to anyone again.
E) that each concert is different and customers will miss a unique experience if they are not present at the concert.