An effective informative speech shows listeners A. why they should change their attitude about the topic. B. something they didn't previously know. C. correct way to follow a procedure. D. why they should adopt a certain viewpoint.

The correct answer is letter B

When an effective speech is made, he will present things that the audience did not leave before or did not fully understand, and this is extremely important, it shows that the speaker did a good job and that the people there managed to learn something different.

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step-by-step explanation:

1400 - 15% to get the answer.

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