Every Three Months or So,Stanley Cleans the Lint Out of the Long

Every three months or so,Stanley cleans the lint out of the long vent to his clothes dryer.It is a messy job that Stanley hates.It is too bad that Stanley has never heard of the Casabella Bendable Dryer Vent Brush,a specially designed brush that would make his life a little easier.For Stanley,the dryer vent brush is a(n) _____ product because he doesn't know the product exists.

A) heterogeneous shopping
B) specialty
C) unsought
D) convenience
E) exclusive