A. It’s fiction. If anything anywhere is made up, it has to be fiction. This gets complicated, though. If you’re making some parts up and calling it fiction, then it gets dangerous to have lots of real people and names thrown in there, because you could get sued because you’re including them in a story that is not 100% true.
My advice? Do however much research it takes to piece together these parts you have to make up. Figure out what happened and make the entire story nonfiction. Writing it as “narrative nonfiction” allows your readers to experience this journey as it unfolds, like a novel would. Narrative nonfiction is a bit “hot” right now, so this is your best bet.