On a food label, the "% of daily value" table compares key nutrients per serving for a person consuming how many kcalories daily?

The answer here is 2000 Calories (kilocalories).

The % of daily value located on the right side of the Nutrition Fact label provides information on how food a person consumes that contributes to the overall total recommended intake of a specific nutrient. The 2000 calorie number is general number as many people tend to fall in this estimate given their daily caloric intake. Some may be lower or higher, all depending on the person caloric need.