Final answer:
The common food sources of omega-6 fatty acids are vegetable oils such as corn, soybean, and sunflower oils, which are abundantly present in the American diet. Other options like nuts and fish generally provide omega-3 fatty acids.
Step-by-step explanation:
Common food sources of omega-6 fatty acids include vegetable oils such as corn, soybean, and sunflower oils. These oils are prevalent in the American diet as they are frequently used in processed foods and for cooking. While other sources like nuts and fish provide essential fatty acids, these typically offer omega-3 fatty acids rather than omega-6.
Option C) Vegetable oils (like corn, soybean, and sunflower oils) is the correct answer since these oils are rich in omega-6 fatty acids, which most Americans easily consume given their heavy presence in our food supply.