As she trains for a marathon, Kim wants to increase the percentage of total kcal in his diet that is contributed by carbohydrates. On average, he consumes 3200 kcal per day during the training period. She wants 60% of his daily energy intake to be supplied by carbohydrates. Based on this information, she should consume___ grams of carbohydrate daily.
a) 1920
b) 960
c) 768
d) 480