The correct response is: The slaves grew their food for them.
The Spartans were able to focus on military training and fighting because the slaves and women in their society were responsible for growing their food. The slaves, who were known as helots, worked in the fields and provided food for the Spartans. This allowed the Spartan men to dedicate their time and energy to military training and warfare. In addition, the women at home also took on the responsibility of food production, ensuring that the men had enough sustenance while they were away fighting. This division of labor allowed the Spartans to prioritize their military endeavors without having to worry about the daily tasks of food production.