According to the situation where an invitation is given to an important political figure was invited to make a speech. However, because you cannot give her an honorarium, reminding her that she is speaking to future political figures is an example of Indirect benefit.
Based on the scenario, the person who gave the invitation is using a way to encourage the political figure that even though she would not get an honorarium, she would be making an impact to the futre politicians.
This is an effective way to make the political figure to give her speech.
Therefore, the correct answer is option B
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