Respuesta :
The correct answer is E) 375 degrees Fahrenheit.
The temperature should Martha preheat the oven is 375 degrees Fahrenheit.
That is the recommended temperature to preheat the oven to make it ready when the time comes to introduce the bagel into the oven. There is a recipe from famous English Chef Nigella Lawson, that recommends preheating the oven from 275 to 400 degrees Fahrenheit.