Which salad mentioned includes kale as a primary ingredient?

The choice indicating that Kale Salad includes kale as a primary ingredient is accurate because the name itself identifies the main component of the dish—kale. This leafy green is the star of the salad, often featured with various dressings, nuts, fruits, and other toppings that complement its robust flavor and texture.

In the context of the other salads mentioned, the Caesar Salad primarily consists of romaine lettuce, while the Garden Salad typically includes a mix of various vegetables. Spinach Salad, as the name suggests, centers around spinach rather than kale. Therefore, Kale Salad stands out as the clear choice due to its specific focus on kale.