In these scenarios, the person who would most benefit from a Headstart program is "A young mother of a 3-year-old, who struggles to make ends meet on a minimum-wage job."
Explanation:
Head Start programs are specially designed to help children coming from low-income families, from the moment of birth up to 5 years old, therefore the other scenarios are not viable for this social assistance program since they're older than the eligible range of age. Besides, it is stated that the young mother perceives a minimum-wage, another factor that is necessary to apply to this service. The scenario of a young mother with a 3-year-old represents the best option to use these benefits properly.