Final answer:
The sentence suggests that Scarlett has one box of baking soda in her cupboard.
Step-by-step explanation:
The sentence suggests that Scarlett has one box of baking soda in her cupboard. The sentence mentions 'the box of baking soda' which implies that there is only one box. Additionally, it states that Scarlett had purchased it several years ago and that it had expired, indicating that she has had the same box for a while.