Denoma, a major consumer-electronics maker, had a sizeable decline in sales revenue for its most recent fiscal year. This result appears surprising, because electronics retailers report that although their overall sales were considerably lower than in the previous year, their sales revenue from Denoma models actually grew, largely thanks to some innovative and popular models that Denoma introduced. Which of the following, if true, does most to explain the apparently surprising result? ["A significant proportion of Denoma's revenue comes from making components for other consumer-electronics manufacturers.", 'Unlike some of its major competitors, Denoma has no lines of business outside consumer electronics to provide revenue when retail sales of consumer electronics are weak.', "Because of the need to educate the public about its new models' capabilities, Denoma's advertising spending was higher than normal over the period.", "During the period, consumer-electronics retailers sold remaining units of Denoma's superseded models at prices that were deeply discounted from those models' original prices."]