Solution

After power is initialized, the system starts the booting process.

First, the firmware present in ROM starts execution.

So, first step is:

III. Firmware ROM loads boot block

Then the bootstrap loader is loaded from the disk.

So, second step is:

I. Bootstrap loader is loaded from the disk

After that, the bootstrap loader loads the kernel into memory.

So, third step is:

II. Kernel is loaded onto the memory

Correct order is:

III, I, II