Answer:
1.
Step-by-step explanation:
The option Paula can choose to ensure that the animation she has created in her presentation repeats is the transition. She can find the option of transition from the Transitions tab.
After selecting the Transitions tab, choose the effect you want to create in your presentations. You can also choose the sound of transition, or either you want to create on one slide or all slides, etc.
Therefore, option 1 is correct.