Bee : Honey :: Cow : ?

The correct answer is D. Milk.

Bees produce honey from nectar and pollen, while cows produce milk from grass. Both honey and milk are nutritious substances that are consumed by humans.

Option A, Animal, is incorrect because it is too broad. Bees and cows are both animals, but they are not the same type of animal. Bees are insects, while cows are mammals.

Option B, Water, is incorrect because it is not a product that is produced by cows. Cows do drink water, but they do not produce it.

Option C, Grass, is incorrect because it is a food that is consumed by cows, but it is not a product that is produced by cows. Cows eat grass to produce milk.