Bonus packs A)offer consumers an extra amount of a product or service but at a higher than normal price. B)help marketers provide extra value to consumers without having them do anything more than purchase the product. C)are not an effective way of loading consumers with a product and reducing their susceptibility to a competitor's promotional offer. D)are always welcome by retailers since bonus packs never require extra shelf space and increase retailers' profit margins. E)result in a higher cost per unit for the consumer.