Which of the following is not a protein option for fajitas?

The choice of salmon as the correct answer highlights that it is not a typical protein option for fajitas. Fajitas are traditionally made with proteins that can hold up well to grilling and have a more traditional Tex-Mex flavor profile. Common options include grilled chicken, steak, and carnitas, which are all popular choices for this dish, offering robust flavors and a satisfying texture after being grilled.

Salmon, while certainly a nutritious and flavorful fish, is not typically associated with the fajita preparation method. Fajitas are generally served with a sautéed mix of peppers and onions, and the focus is usually on more common meats like chicken and steak, which complement the dish's seasonings and cooking style. Because of this, salmon stands out as an atypical choice in this context, reinforcing why it is the option that does not belong.