Carlos began his speech with, "how much would you give to spend one more day with someone you have lost." was an effective way to begin his speech because the audience members could think about their response rather than actually state it out loud during the presentation. This would be an example of a .

This is an example of a "RHETORICAL QUESTION'.

Explanation: Rhetorical questions are those questions, that does not have a specific answer or the answer is already known by everyone. This questions does not need to be answered when asked, it is used to draw the audience attention when presenting a public speech. This question gives the audience a self talk and makes them to concentrate more on your speech, because they will want to extract the answer from the meaning of your speech.

For Carlos to start his speech using a rhetorical question, he has gotten an audience, who wants to think about the answer to the questions instead of speaking it out loud. At that moment the place will be silent, and any speech he makes from then on, can be clearly heard and understood, because he has activated they brain.