What is a raincheck at the grocery store? A Aguarantee that the sale litem you want will be back in stock by the end A of the week. B A guarantee that you can purchase the item at the sale price for the next week. C it's back in stock. A guarantee that a store will set aside the item you are looking for when D Aguarantee that you can purchase an out-of-stock sales item at a future date for the sales price.