问题如下：
Which of the following is an appropriate statement regarding the movement along of good X along demand curve?
选项：
A. Change in policy
B. Change in good X’s price
C. Change in income
解释：
B is correct.
"Movement along"refers to a movement of a point rather than a line movement. Only change in own price can result in movement along.
考点：需求曲线
解析：当该商品价格变化时，需求曲线上的点会沿着需求曲线移动。所以B入选
A选项和C选项说法只会导致需求曲线本身发生平移
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