Answer:
d) should simply look at people's faces rather than into their eyes.
Explanation:
Based on the information provided within the question it can be said that Hayao should simply look at people's faces rather than into their eyes. As the client would get the feeling that you are looking at them in the eyes and thus illustrating interest in them, but at the same time since you are looking at their faces you will not lose your train of thought and instead be able to finish the presentation correctly and without interruptions or errors.