The sport of running is easy.

　　题干大意：跑步这项运动很容易。题目的关键词是"easy"，对应原文第二段最后两句：But don't be fooled into thinking the sport of running is easy. It requires discipline and concentration.原文是说不要错误地认为跑步这项运动很简单，它是需要训练和集中精力的。题目内容与原文内容不符，故选B。