Answer:
c.Yes. She should have displayed blank slides between the photographs.
Explanation:
Based on the information provided within the question it can be said that yes Gillian should have display blank slides between the photographs instead of putting the photograph slides one after the other. This would have allowed Gillian to explain the upcoming slide before presenting it and thus having the audience concentrate solely on what she was saying. This would also would cause a more emotional response in viewers when they see each slide.