I choose topic B -- what is important when aiming to sell goods on the interact. Regarding this topic, there are three points I want to discuss here.
To start with, delivery time is an indispensable point. Since selling goods on internet is a direct way of business, and the buyer can not get the goods right now. So the delivery time should be calculated and told to consumers.  And the time should be short, because of the feature of business on intemet.
In addition, with many competitors on in temet, you should give special offers to attract more consumers, such as discount and free postage and so on.
Finally, the range of sending goods should also be considered. Different from the regular business, all people around the country are able to buy goods on internet. Therefore, the wide range of goods can attract various consumers. Then the sales will increase quickly.
In conclusion, delivery time, special offers and the range of goods are all important points when aiming to sell goods on internet.