Refer to Figure 3.2.4. Theodore's budget line has changed from A to
B: Which of the following explains the change in Theodore's budget line?
选项：

A:The price of food and the price of clothing increased.
B:The price of food increased, and the price of clothing decreased.
C:The price of food decreased, and the price of clothing increased.
D:The price of food and the price of clothing decreased.
E:none of the above