The correct answer is C. from.
A fox differs from a dog in many ways. For example, foxes are typically smaller than dogs, and they have a long, bushy tail. Foxes are also more agile than dogs, and they are better climbers. Additionally, foxes are typically nocturnal animals, while dogs are diurnal animals.
The other options are incorrect because they do not accurately describe the relationship between foxes and dogs. Option A, in, is incorrect because foxes and dogs do not differ in the same way that two objects might differ in size or shape. Option B, for, is incorrect because foxes and dogs do not differ in the same way that two people might differ in their opinions. Option D, with, is incorrect because foxes and dogs do not differ in the same way that two groups of people might differ in their cultures.