To Lose One Pound of Fat in a Week, What

To lose one pound of fat in a week, what combination of changes in your diet and exercise is needed?

A) Reduce food intake by 200 Calories per day and increase exercise to burn off 300 more Calories per day.
B) Reduce food intake by 300 Calories per day and increase exercise to burn off 100 more Calories per day.
C) Reduce food intake by 400 Calories per day with no change in exercise.
D) Increase exercise to burn off 400 more Calories per day with no change in diet.