Answer:
The spokesperson should Increase the image (i.e. make it bigger than the images on other slides) on the slides containing a new vehicle model
Explanation:
To make the slide that contains a new vehicle model to standout from other slides in the presentation without altering the colors and contents of the slides, The spokesperson should Increase the image on the slide without changing the slide content. that way he can capture the attention of the investors when they see the slide for the first time.