Final answer:
A dietitian implementing a home delivered meals program for the elderly chooses a non-selective menu primarily to minimize labor cost.
Step-by-step explanation:
The dietitian implementing a home delivered meals program for the elderly chooses a non-selective menu primarily to minimize labor cost. A non-selective menu means that the same set of meals is delivered to all clients, reducing the time and effort required to plan and prepare individualized menus for each person. By minimizing labor cost, the dietitian can ensure the program remains cost-effective while still providing nutritious meals to the elderly.