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Answer :
The instruction that cannot be used to switch to user mode is c. ORI #0, SR.
To switch to user mode on a Motorola 68k processor, the Supervisor bit (S bit) in the Status Register (SR) needs to be cleared. This bit controls whether the processor is in supervisor mode (privileged) or user mode (non-privileged).
Among the provided instructions, those that directly modify the SR and potentially clear the S bit include: "MOVE #0, SR", "ORI #0, SR", "ANDI #0, SR", and "EORI #$FF00, SR".
These instructions manipulate specific bits of the SR to achieve the desired mode switch. However, "MOVE #$0480, SR" sets the entire SR, which includes setting the S bit (bit 13) to 1, maintaining supervisor mode.
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