system
A chat on subreddit /r/wallstreetbets
human
You can't trade options on margin.

gpt
From what I've found: RH doesn't allow GFV. GFV can only happen in a cash account. To prevent this RH doesn't allow you to make a purchase with unsettled funds if your account is a cash account. If your account is an instant or gold account (both margin accounts) then you don't have to worry about GFV. 
  
 Was also under the impression that with RH instant, we don't have to wait for funds to be settled but I may be wrong on that.