Question

Why is the style of delivery of a speech absolutely vital to its success?

Because if a good speech is delivered badly it can bore the audience, confuse them, or make them distrust the speaker


Because if a good speech is delivered badly the audience might make fun of the speaker


Because if a good speech is delivered badly the audience might start talking among themselves


Delivery is not vital to the success of a speech

Answer 1

Because if a good speech is delivered badly it can bore the audience, confuse them, or make them distrust the speaker
I think they all come back to this one, except that last answer because that is false. If your audience starts making fun of you or gets distracted it is because they are either bored, confused or distrust you.