Answer:
D They are rich in complex carbohydrates which can be broken down for energy, and their B-complex vitamins are involved in metabolic processes that release this energy
Step-by-step explanation:
A substance is a good source of energy if it is rich in complex carbohydrates.
- Carbohydrate rich food substances that produce energy when broken down.
- They are the main stay for power in the body.
- Vitamin B-complex helps in carbohydrate metabolism.
- Deficiency of this vitamin hinders the rate at which metabolism of carbohydrate occurs.
- Therefore, the listed grains are good sources of energy.