Answer:
(B) The superstores’ heavy advertising of their low prices has forced prices down throughout the retail market for office supplies.
Step-by-step explanation:
If the superstores have the financial means to produce heavy advertising of their low prices, this advertisements will reach a wide group of customers, who will now have lower price expectations for the market of office supplies, whether these are offered by large superstores, or by small retail stores.
Because small retailers likely do not have the economies of scale to allow for prices as low as the large superstores, they have a high probability of being taken out of business.