First of all I want to say this: when you are trading anything through a forex broker, you are not trading the actual instrument itself, instead you are trading a "derivative" of that instrument.
So when you talk of trading options through your forex broker, you are not trading the real option contracts instead you are trading a derivative of the options contract meaning you do not own the actual options.
Now to the definition of options, an option is a contract (between the option seller & option buyer) that gives the buyer the right but not the obligation to buy or sell a given quantity of an instrument, at a given "strike price" on or before a given time.
The option buyer pays a "premium" to the options seller in order to purchase the contract but the buyer is under no obligation to follow through with the agreement contained in the options contract.
If the options buyer chooses to walk away from the contract there is no problem but he will have to forgo the premium he paid to the options seller.