Which of the following devices should get higher priority in assigning…

Interrupt priority is generally assigned based on how urgent and time-sensitive the device service is. Among the given devices, a hard disk has the highest data-transfer rate and is more sensitive to service delays than a printer, keyboard, or floppy disk.

If a high-speed disk controller is not serviced promptly, data transfer can be delayed or buffers may overflow. Slow devices such as printers and keyboards can usually tolerate more delay.

Therefore, among the given options, the hard disk should get the higher interrupt priority.