【单选题】

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.