The most important thing you can do with the little bit of preparation time you may have for an impromptu speech is
a. make sure you look presentable
c. write an outline
b. try to hide
d. ask people questions

c. write an outline

Explanation:

Impromptu speech refers to the speech which is delivered without any preparation or prior information. The topic is provided to the speaker can be in any form. In the competitions held in the high schools, the candidate is provided with a topic. Also, he gets a certain time to prepare his speech. The student prepares an outline of his speech before delivering it.

the correct answer is self-disclosure must be voluntary.

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