A question that is “on topic” is related to the discussion.
The opposite would be called “off topic”; that would be a question that is not related to the subject.For example, if I'm speaking about U.S. history and you ask a question about Japanese Sumo wrestling, your question would be off topic.
But if you ask about President Abraham Lincoln, your questions would be on topic.Shawn is asking everyone to please make sure, or be careful, that their questions are on topic, or related to the Vision Corporation product or marketing strategy.
Then Shawn asks who would like to begin the discussion.Chris says that he needs to voice his concern.
To “voice one's concern" means to say what you are worried about.You might need to voice your concern with your boss about not being able to finish a project on time.
Chris is voicing a concern, or saying that he is worried, about how the focus groups weren't asked about the product's color or design.Chris begins to say, “I think this would have…,” but he is interrupted by Hannah, meaning that she begins speaking before he is finished.
This is normally not considered a polite thing to do, but notice what Hannah says next.Hannah says, “Please pardon (pardon) my interruption.”
The phrase “please pardon my interruption,” or you could also say, “forgive my interruption,” is used to apologize when one person has something important to say and starts speaking while another person is speaking.It's a way of excusing yourself, to talk when someone else is talking - to interrupt them.
Usually this is something that you will do if what you have is very important, so important that you need to stop the other person talking.So, Hannah is saying “sorry” to Chris for having interrupted him.