Answer: target
Step-by-step explanation:
A target market are the group of customers which a business or a company directs the resources and its marketing efforts towards.
From the question above, since Millennials who patronize restaurants and other out-of-home food purveyors have become increasingly health- and nutrition-conscious, the strategy used by many fast food companies to improve the nutritional profile of their menus by adding items such as salads, fresh fruit, and plant-based meat substitutes is intended primarily to target millennial customers.
The fast food companies are aware that by adding items such as salads, fresh fruit, and plant-based meat substitutes, this may convince Millennial customers to try them out.
Therefore, the answer is option d"targets".