The correct answer is option 3. In this diagram, there are three overlapping circles representing three categories: animals, cows, and horses. The largest circle represents the category of animals, which includes both cows and horses. The second circle represents the category of cows, and it overlaps with the animals circle to show that cows are a type of animal. Similarly, the third circle represents the category of horses, and it also overlaps with the animals circle to show that horses are a type of animal.

This diagram accurately illustrates the relationship among animals, cows, and horses. It shows that both cows and horses are types of animals, but they are not the only types of animals. The overlapping circles demonstrate the hierarchical relationship between the categories.

It`s important to note that the other options do not accurately represent the relationship among the three categories. Option 1 just shows three separate circles without any overlapping, which does not illustrate any relationship. Option 2 and option 4 show incorrect relationships between the categories, which makes them incorrect.