For a "Superstar" to Emerge, It Must Be the Case

For a "superstar" to emerge, it must be the case that

A) it is possible to supply the good or service that the superstar produces at low cost to every customer.
B) some customers are willing and able to pay large sums of money to enjoy the good or service provided by the superstar.
C) the superstar has a natural monopoly on his or her good or service.
D) the superstar can become sufficiently popular to earn income from advertisements.