To determine which organism feeds on the largest variety of organisms in a food web, we can consider the dietary habits of the options provided:
A. Fox - Generally omnivorous, foxes eat a wide variety of small mammals, birds, fruits, insects, and occasionally carrion. B. Hawk - Primarily a carnivore, hawks mainly eat small mammals and birds, but generally have a more specific diet compared to omnivores. C. Frog - Frogs are carnivorous, primarily feeding on insects and other small invertebrates, but they can also eat small vertebrates depending on their size. D. Snake - Most snakes are carnivorous, feeding on a variety of small mammals, birds, and occasionally amphibians, but they tend to have specific prey preferences.
Given this information, the fox (A) is likely the organism that feeds on the largest variety of organisms in the food web, due to its omnivorous diet that includes both animal and plant sources.