A small action doesn't work to change one's habit.

　　题干大意：一个小的举动不能改变一个人的习惯。该题的关键词为“A small action”和“doesn't work to change”，定位到文中第五段的第二、三句，“We can't change that all once, but you can do something. For example, you can start with a small action”，我们不能一次性地就改变了我们所有的坏习惯，但是你可以先做一些。比如，你可以从一些小事做起。该题为细节理解题，题目与原文意思相悖，故选B。