Final answer:
The correct sentence in the past simple tense is 'Cocinó la comida italiana'.
Step-by-step explanation:
The correct sentence in the past simple tense is Cocinó la comida italiana. This sentence matches the subject 'Mi suegra' (referring to 'my mother-in-law') with the action 'cocinar la comida italiana' (meaning 'to cook Italian food'). In Spanish, the past simple tense is used to talk about completed actions in the past.
Learn more about Past simple tense in Spanish