题目内容：
In her persuasive speech, Wei Ling concluded with the following statement:So the next time you see flyers around campus announcing a blood drive, decide that this will be your moment to get involved—to do something worthwhile, to take a step that may help save someone’s life.What method of concluding her speech did Wei Ling use?
A.Extended example.
B.Appeal to action.
C.Internal summary.
D.Reference to the introduction.
参考答案：