Among the following salad dressings which one contains highest levels of calories and fat A Wishbone Blue Cheese B Regular Ranch C Olive oil D Vinegar?

* Ranch dressing is typically made with a base of mayonnaise, which is high in fat and calories. It also often includes sour cream, buttermilk, and other ingredients that add to its calorie and fat content.

* Wishbone Blue Cheese dressing will contain some fat and calories from the blue cheese and other ingredients, but likely less than Ranch.

* Olive oil is high in healthy fats, but it's a pure oil and doesn't contain the other ingredients that contribute to the calorie count of a dressing.

* Vinegar is very low in calories and fat.

Therefore, Regular Ranch dressing is the most likely to have the highest levels of calories and fat among the options given.