Simple" and "complex" Carbohydrates are nutrients that help to give the body energy.
Daily values are best described as a set of nutrient intake standards to represent the needs of typical consumers and used as standards for expressing nutrient content on food labels. Which is Letter D - both b and c are correct.
It would take a week or seven days because one pound is about 3,500 calories and 500x7 is 3,500. Hope that helps :)