Answer:
Option B
Step-by-step explanation:
There is a built in functionality in every OS ( including windows and IOS ) that reboots the system whenever the temperature of Processor reaches to a certain limit. This functionality is to save the hardware of computer so that nothing of it will burn by rebooting the PC which in this specific case will start the fans of computer to run with rather high speed to take out as much heat as possible.
Option A is rejected because Bad network card will result problem in using the network and will not reboot the system.
Option C will make the PC UPS to not to start the computer rather than rebooting it.
Option D will result in no windows start functionality rather than rebooting it.