Final answer:
Magdalena, as a feedlot farmer, is most likely to sell young cattle at the age of 15 months.
Step-by-step explanation:
Magdalena, as a feedlot farmer, would most likely be involved in c. selling young cattle at the age of 15 months. In a feedlot, cattle are raised for the purpose of being processed into meat products such as hamburgers and steaks. They are typically fed a steady diet of corn and silage until they reach a suitable weight for slaughter. Therefore, Magdalena's main focus would be to raise and sell cattle for meat production.