Use another option as a stoploss.
As in a spread? That's a different view than a naked option.
Use another option as a stoploss.
Use another option as a stoploss.
My original question was how do you determine 5% risk on a naked option. Not on a spread.
Like you said, a naked option has theoretically unlimited loss potential on a gap. You can place a stop loss to limit risk, but if it gaps, you're boned.
A stop loss or a spread are both designed to mitigate risk. I'd say with a spread you are at least still in the trade if it recovers.
I am not an expert but I can't think of a way to properly limit your risk on a naked option besides...not making it naked.