A、To warn people not to do it too often B、To suggest people keep cool after being cheated. C、To advise people think enough befor

Good morning. Have you ever bought a shirt or dress online only to later find out when it was delivered to you that what you saw online was quite different from what you received? In this scenario, what do you think would be your next line of action? Well, you can either throw your hands up in the air while running around your neighborhood yelling, "I’ve just been cheated!" or you could try to return the shirt you just purchased. Whichever one you choose, the deed has been done. You already have made payments even before your shirt was delivered to you.
    If you have gone through such an experience as this, you’d find out that more often than not, it is usually a "not too good" experience. You will begin to regret why you ordered and paid for what you don’t like. And I bet that nobody bargains for such an experience.(20)This is why it is very important for you to be double sure that you are spending your hard earned money on what you truly want.
    With the emergence of the World Wide Web in the early 90s, a lot of things became possible to achieve, including online banking and online shopping or e-commerce.(21)The days of waiting in a queue to get that very important product at the stores then became drastically reduced: as online shopping evolved with the promises of salvaging so many people who didn’t have time to check at different shops for what they wanted before buying.
    It is therefore very expedient for every shopper to be armed with the right information, before shopping online so as to save the stress of regretting the purchase. So, here are facts you, as an online shopper, must know in order to have a successful shopping experience.
     (22)Before you purchase an item online, be sure to ascertain if what you are buying has a free shipping tag. This is so that you don’t have to overshoot your budget. If what you have planned to spend on a product is 70 dollars, and the shipping costs an extra 20 dollars, it would be better for you to decide from the onset if you are ready for the extra cost.
    Before you make a purchase, go to the site and read the description and product information to be sure it has a free shipping tag or not. However, one good way to be sure is to actually contact the product owner. This gives you extra assurance of the true cost of shipping.
    Hope you enjoy today’s speech. Thank you!
20. Why does the speaker mention the example of online shopping?
21. What does the speaker say about the World Wide Web?
22. What does the speaker suggest people do before purchasing an item online?