The b best answer that I could see is D because it correlates to the actual question. But c also looks good because it gives a reason as why not to buy them from a shop/private owner.
Best of Luck...Nathan...L.
<em>The key difference between a central idea and a motif is </em><em>b) A central idea is abstract, while a motif is concrete. </em>
A <u>central idea</u> of a literary work -the theme- is the dominant idea the author wants to conveys. <u>Motifs</u>, on the other hand, are all the devices the author uses to support that main idea, such as images, symbols or words. <u>Motifs</u> have a symbolic value and remind the reader about the theme.