The average daily caloric intake can vary based on factors such as age, sex, activity level, and overall health. However, a commonly used guideline is that the average adult male needs about 2,500 calories per day, while the average adult female needs about 2,000 calories per day. Based on the options provided, the closest answer would be:
D. 2,000.
This would generally apply to an average female or a general guideline for adults in moderate activity.