Which troubleshooting option should be avoided if the multi-touch screen is responsive?

When the multi-touch screen of a device is responsive, it indicates that the hardware is functioning correctly in that respect. Therefore, performing a factory reset is an extreme troubleshooting measure that should be avoided in this scenario. A factory reset erases all data, settings, and applications from the device, returning it to its original state as if it were new. This is typically only necessary when there are significant software problems that cannot be resolved through less drastic means.

In contrast, options like closing unused applications, resetting network settings, and clearing storage space are all non-invasive measures that can often resolve various issues without the need to erase personal data. These actions can optimize device performance and address minor glitches while preserving user data, making them preferable in situations where the device's functionality is otherwise intact.