$.$ A convenience store $\_\_\_\_\_\_\_\_.$

A$)$ markets to segments comprised mostly of white$-$collar workers

B$)$ stocks narrow product lines that have wide, deep assortments

C$)$ carries a limited line of high$-$turnover goods for consumer self$-$service D$)$ involves high operation costs due to full$-$service customer assistance

E$)$ is a multi$-$channel food and discount retailer that targets niche markets