While presenting a persuasive speech encouraging people to try sky diving, you realize your audience is not paying attention because
a) they are focusing on something in their laps or at their feet.
b) they gasp with excitement when you tell them you have made 35 jumps.
c) they nod and comment to each other about how they might try to sky dive.
d) they are intently looking at your power point slides of your sky diving experience.