The term 'Diner Option' can be broken down into two crossword solutions: BOOT (4 letters) and BOOTH (5 letters). BOOT is a type of footwear, usually made of leather or rubber, that covers the foot and ankle. BOOTH is a small enclosed area, typically with seating, that is used for private conversations or activities. In the context of a diner, a BOOTH would be a private area where customers can sit and enjoy their meal.