单项选择题

Why does the author mention Davy Crockett in Paragraph 1

A.Because this is an example of the type of people among whom demands for portraits were constant.
B.Because Davy Crockett was a famous artist who would hold a display in his Boston gallery.
C.Because this is an example of the way artists used to attract attention and business.
D.Because gallery owners used to have famous people as customers.