Option 1 can be ruled out because rice is a rich source of carbohydrates. However, it is worth mentioning that vegetables, particularly leafy greens, are an important source of vitamins.

Option 2 is the correct answer. Since the diet consists only of rice and potatoes, which are primarily sources of carbohydrates, it lacks sufficient protein. Proteins are essential for the growth, repair, and maintenance of body tissues, enzymes, hormones, and antibodies. Without an adequate protein intake, the person is likely to suffer from protein deficiency, which can lead to various health problems such as muscle weakness, poor immunity, and slow healing.

Option 3 is incorrect because it includes carbohydrates, which are already present in the diet.

Option 4 is incorrect because the diet includes carbohydrates from rice and fats are not mentioned as a component of the person`s diet.

In summary, the person is likely to suffer from protein deficiency due to the absence of adequate protein sources in their rice and potato-based diet.