树雪问题

chloeyeah21

a cafeteria has a lunch special, consisting of soup or salad, a sandwich, coffee or tea, and a dessert. If the menu lists 3 soups, 2 salads, 8 sandwiches and 7 desserts, how many different lunches can you choose (Note: two lunches are different if they differ in any aspect
A. 22 B. 280 C. 336 D. 560 E. 672
我选B.
老师说 有 or 用加法， 有and用乘法。
（2+3） * 5*7=280
这样想法对不对啊？老师讲完，没说答案，来CD上讨教一下
另外，这种题，是否如果题目中两个项目之间有逗号，就相当于用了单词and，就要用乘法啊？

sdcar2010

(3+2)*8*(1+1)*7=560