Questions 149~150 refer to the following text. 
If you need to buy an on-the-spot snack, make it something reasonably nutritious. Tryto shop after a meal, so your children aren’t hungry, and let them know they canchoose only one item. Since small children are too young to choose from an entireaisle of food, pick out two or three items that you find acceptable and that you knowthey like, such as rice crackers or a small banana, and let them choose which onethey want.
In general, try to limit the number of sweet snacks that you keep at home to one ortwo types of biscuit and one flavor of ice cream, for example. And stock up ondifferent healthy snacks. Be aware, though, that some healthy-sounding snacks arefull of sugar–for example, cereal bars contain a lot of sugar and many fruit juicedrinks have added sugar or artificial sweeteners.
【題組】149.What is the main topic of the text?
(A)“Do children need vitamin supplements?”
(B) “What are some nutritious alternatives to sweet foods?”
(C) “How can I make snacks healthier?”
(D)“Healthy eating is all about balance.”