The option that is not a source of carbohydrates is d. gram.
Explanation: Rice, millets, and sorghum are all grains that are considered good sources of carbohydrates. Gram, on the other hand, is primarily a source of protein. While it does contain some carbohydrates, its protein content is significantly higher.
Why other options are incorrect:
Rice:
Rice is a staple food in many cultures and is a rich source of carbohydrates. It provides complex carbohydrates like starch.
Millets:
Millets are also a type of grain with a high carbohydrate content. They are known for their nutritional value and slow-digesting carbohydrates.
Sorghum:
Sorghum is another cereal grain that is a good source of carbohydrates. It is used in various dishes around the world.