Answer:
Store is the Defendant
Explanation:
Defendant is the person or organisation, sued or accused in court of law. Defendant is accused for causing any harm to the person (called Plaintiff).
Eg : My car being damaged by someone makes me plaintiff, having right to accuse defendant responsible for my damage.
Adriana claiming to have suffered arm injury by slipping due to store's freezer leakage : is case of harmed plaintiff Adriana due to Defendant Store facilities. She has lost her health & time, treatment money due to the injury & accuses Store for the same.