Answer:
C. She should use a different transition on each side.
Step-by-step explanation:
Using different transition make the slides look more attractive. It helps to gain attention from the audience as it shows the skills and efforts of the presenter. On the other side, Mara should not use two animations on each slide as repeating the same thing on every slide make the presentation boring. Also, the use of the same transition for every slide does not show any effort of the presenter. When a presentation shows the effort and skills of a presenter, it automatically gains close attention from the audience.