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.