Pasta, Bread and breakfast cereal are all types of complex carbohydrate that provides energy to our body. The answer to the question is option "D" among all the options that are given in the question. . It has been proved by research that complex carbohydrates help to reduce stress of a person. The presence of caffeine in refined carbohydrates actually increases the stress level of a person. It has been recommended by the World Health Organization that 50% to 80% of the diet people eat should consist of complex carbohydrate rich foods.