Deselecting the 4:3 aspect ratio allowed me to see the bottom dialog choice and finish the conversation. Apparently, to maintain the 4:3 aspect ratio they chose to match the horizontal dimension to my display and then clipped some off the bottom, rather than fitting the vertical dimension to my display and leaving black bars to the right and left.
Without the 4:3 aspect ratio selected, the picture is a little distorted (stretched out horizontally). I guess I would have preferred maintaining the aspect ratio with black bars to the right and left of my display. It's a pretty good game so far, so it's something I can live with.
Thanks for your help, MaG!
I point, therefore I click.