Answer:
The answer is the complexity of the speech.
Explanation:
The reason for offering a summary statement of a speech is to give the audience a brief and easily understandable version of the topic that you've talked about and the most important consideration to help you decide to have a summary of your speech or not is the complexity and length of your speech which are the qualities that directly affect the level of comprehension the audience has of the idea so in certain situations, offering a summary can be necessary.
I hope this answer helps.
