Final answer:
In the described scenario, Arianna faced a c)malware attack evidenced by the unauthorized activation of her laptop camera after connecting a found flash drive.
Step-by-step explanation:
The scenario described involves a malware attack. This is evident from the fact that, after Arianna plugged the found flash drive into her laptop and accessed files, her laptop camera became active without her knowledge or consent. It is likely that the flash drive contained malware programmed to execute once the drive was connected to a computer. This malware might have the capability to compromise the system's security and allow an attacker to remotely activate the laptop's camera.