Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 39 to 43.

A gift card is a card that is issued by a particular store. It’s worth a certain amount of money. It looks like a credit card, but it actually works like cash. A gift-card holder can spend the amount of money noted on the card in the store that issued it. These cards are big money makers for retail companies. One reason is that when gift-card holders go to the store, they often see other things to buy, and they end up spending more money than the gift card is worth. Unused cards are another big source of revenue. Companies make millions of dollars because large numbers of people never use their cards. They either lose them, forget about them, or decide that it’s not worth the effort.
Gift cards are becoming extremely popular in many countries around the world. In the United States, they are one of the most popular types of gifts. Why? People love the convenience – cards are easy to buy and easy to use, either in the store or online. The recipient can select his or her own gift, and the giver does not have to worry about finding just the right thing.

Câu hỏi

The word “they” in paragraph 1 refers to ______.