What percentage or dollar amount is best to set a stop when trading options?

What percentage or dollar amount is best to set a stop
when trading options? Option prices can fluctuate quite
a bit, so even if the option eventually increases in
value and becomes profitable, it can drop significantly
before doing so, which means a stop can be triggered
during this temporary drop in value. What amount/percent
works best, to avoid [...]

What is a realistic percentage I should make a year on investments?

The old 10% over the long haul does not seem to be true anymore. I’m not interested in day trading, options, forex or other higher risk money vehicles. I’m more interested in stocks and bonds investing without a lot of trading going on.