Which of the Following Best Describes Category Killers

Which of the following best describes category killers?

A) They are small retailers who handle deep assortments in a limited number of product categories.
B) They are single-line stores that emphasize a single product and effectively market it.
C) They are off-price retailers who compete more on the basis of offering large assortments at lower prices.
D) They are large,low-priced limited-line retail chains that attempt to dominate a particular product category.