The correct answer is option 'D', which means that animal husbandry deals with the care, breeding, and management of domesticated animals, fishes, honey bees, and silkworms.

Animal husbandry is the branch of agriculture that focuses on the raising and care of animals for various purposes, such as food production, labor, companionship, and research. It involves the application of scientific knowledge and techniques to ensure the well-being of animals and to maximize their productivity.

Let's discuss each of the options mentioned in the question in detail:

a) Domesticated animals:
Animal husbandry primarily revolves around the care and management of domesticated animals. Domesticated animals are those that have been selectively bred over generations for specific traits and purposes. Examples of domesticated animals include cattle, sheep, goats, horses, pigs, poultry, and pets such as dogs and cats. Animal husbandry practices involve providing appropriate housing, nutrition, healthcare, and breeding management to ensure the optimal growth and productivity of these animals.

b) Fishes:
Fish farming, also known as pisciculture or aquaculture, is an important aspect of animal husbandry. It involves the cultivation of fish in controlled environments such as ponds, tanks, or cages for commercial purposes. Fish farming practices include selecting suitable fish species, providing nutritionally balanced feed, managing water quality, preventing diseases, and ensuring proper breeding and growth. This branch of animal husbandry plays a crucial role in meeting the increasing demand for seafood and reducing the pressure on wild fish populations.

c) Honey bees and silkworms:
Animal husbandry also encompasses the management of honey bees and silkworms, which are important for honey production and silk production, respectively. Beekeeping involves the maintenance of beehives, providing a suitable environment for bees to thrive, and harvesting honey and other bee products. Sericulture involves rearing silkworms, providing them with mulberry leaves as food, and harvesting their cocoons to obtain silk. Both honey bees and silkworms require specialized care and management techniques to ensure their health and productivity.

Therefore, animal husbandry deals with the care, breeding, and management of domesticated animals, fishes, honey bees, and silkworms. It encompasses a wide range of practices aimed at ensuring the well-being and productivity of these animals for various purposes.