Answer: Potatoes.
Step-by-step explanation:
The potatoes are the richest source of carbohydrates. It is source of energy which is required by the body.
The body requires instant energy for performing several functions of the body. Moreover, the brain requires only glucose for its proper function.
Carbohydrates are the most abundant form of energy found in nature. The foods like rice, potatoes, wheat contains lots of carbohydrates in it.
Hence, the correct answer is option B