Final answer:
If the presider indicates you have exceeded your time limit while speaking, the best action is to politely acknowledge them, thank the presider, and then conclude your speech.
Step-by-step explanation:
When you are at the podium speaking and the presider stands, indicating you have exceeded your time limit, the best course of action is to politely acknowledge and thank the presider, then wrap up your talk. This option shows respect for both the presider and the audience, maintaining professionalism and courtesy. It allows you to conclude your presentation in a controlled manner without seeming abrupt or disrespectful by ignoring the time constraints.
Continuing to speak can be seen as disrespectful to the audience and the event organizers, and asking the audience if they want you to continue can put them in an uncomfortable position. Therefore, the correct option, and the one you should select, is to politely acknowledge the presider and conclude.