Final answer:
Without the context involving characters Gina and Ari, a correct answer cannot be provided based on the given excerpts.
Step-by-step explanation:
The provided excerpts do not mention a character named Gina, nor is there any direct interaction outlined between a character named Gina and one named Ari.
As such, we cannot accurately answer what Gina called Ari on the last day of school. To provide the correct option in the final answer, the context must be clearly related to the question at hand.
From the information provided, the focus is on characters named Adriana, Inayah, Bernice, Marjorie, and their respective social interactions, not Gina and Ari.