Read the following passage and choose the item (a, b, c, or d) that best answers each of the questions about it.
Is computer shopping the way of the future? About 37% of American households now have personal computers. And shopping by computer (or “shopping on-line”) is interesting to more people every day. Already, shoppers can use their computers to order many different products, such as computer products, flowers, food, T - shirts, and posters. A d new online shopping services appear every day. Soon people may be able to shop for anything, anytime, anywhere in the worl
What does the word ‘their’ in line 4 refer to?
- people
- shoppers
- households
- personal computer