Read the paragraph. The dogs would not stop chasing each other. Instruments flew off the shelves of the exam room and the paper covering on the table was in shreds. I had no idea what to do and started to question whether or not I had made the right choice. After I signed up to intern at a veterinary clinic, I had visions in my head of gently holding a tiny kitten, while feeding it a bottle. Or assisting the vet with an exam, or cleaning cages. The situation had suddenly gotten seriously out of control and I was clueless as to how to stop it.

The best way to describe the order of the events in the paragraph is that they are told in

structured order.
unstructured order.
nonchronological order.
chronological order.