Concept:A share is sold at a premium when its market price is higher than its nominal, or face, value.Explanation:The nominal value of the share is NGN50.The quoted price is NGN70.This quoted price is greater than the nominal value because N70>N50.Therefore, the share is being sold above its face value.In commerce, selling a share above its nominal value is known as selling at a premium.Answer:D. at a premium