The correct option is D carbohydrates
Poultry farming is the rearing, breeding and caring of various types of domestic birds like chicken, fowls, ducks, geese and turkeys for the commercial production of eggs and meat.
A balanced diet is the one which has the appropriate amounts of all the necessary nutrients like carbohydrates, proteins, fats, vitamins and minerals.
Carbohydrates and fats are essential for energy requirements and proteins help in building body mass. Vitamins and minerals are essential for a healthy body, strong immune system and proper metabolic functions.
To keep the birds healthy and disease free, they are given a balanced and nutritious diet. This also ensures a good yield of eggs and good quality meat from them.
The feed given to the birds consists of cereals, oil cakes, protein concentrates, fish and meat meals and minerals.
Cereals are rich sources of carbohydrates. So option d is correct.
Oil cakes are made up of the coarse residue that is left after squeezing oil out of oil seeds. They are rich in proteins, fibres, vitamins, fatty acids, etc.