Final answer:
A speaker in North America who holds their arms out with palms facing upward after asking a question is inviting the audience to respond or engage in conversation.
Step-by-step explanation:
In a North American context, when a speaker holds their arms out with their palms facing upward after asking a question, this gesture typically invites the audience to respond or participate in the discussion. It is a non-verbal cue that encourages interaction and implies that the speaker is open to hearing the audience's opinions or answers. This gesture can help create a sense of engagement and inclusivity within the group, making it a common and effective tool for speakers to connect with their listeners.