Discussion
Whenever you have a hardware resource conflict, it will more likely be an IRQ conflict rather than an i/o conflict because:
Answer: A
Correct answer: there are a lot more I/O addresses than IRQs.
A PC has hundreds of free I/O addresses but only sixteen interrupt lines, several of them already taken by the keyboard, timer, floppy and disk controllers. Scarcity is what makes IRQ clashes the common case.
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