Which of the following is a problem facing mail order business?

The cost of postage and advertisement is a problem facing mail order businesses. In order to operate, mail order businesses need to advertise their products to potential customers and deliver those products through the mail. However, the cost of postage can be significant, particularly for larger or heavier items. Additionally, advertising can be expensive, as mail order businesses may need to reach a wide audience to attract enough customers to make a profit. These costs can eat into a mail order business's profit margin and make it difficult to compete with other types of retailers. Despite these challenges, mail order businesses can still be successful by finding ways to keep costs low, such as by using targeted advertising or negotiating bulk postage rates.