Choose three nutritional labels off of food packaging. explain the ingredients and how to read each label in terms of calories, protein, carbohydrates, fats, and percentage of daily recommended dietary value.

The nutritional label (also referred as Nutrition Facts) gives detailed information about a food's nutrition content: the amount of fat, proteins,calories...
Nutrition fact help us to make healthy food choices.
1. Proteins are build from amino acids and contribute energy (calories) to the body). Protein should account for 10-35% of your daily calorie intake. 
2. Carbohydrates are the main source of energy of the body.  Carbohydrates should account 45-65 % of your daily calorie intake. 
3. Calories are units to measure energy. The amount of daily calories needed depends on gender, age,height, way of life...
According to this, the percents in the Nutritional labels point how much from your total daily needs the specific food is.

Think it's rice because in many countries rice is the main food so it can be traditionally served all at once.