Aserving food that has 10% to 19% based on a 2000-calorie diet is considered to have

Such a food would have from either 200 to around 380-390 calories. A food item which could be found within this caloric range could be for example a couple of eggs or a good cut of lean meat which would be grilled on a barbecue. 

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The answer would be d. most contraceptives are effective when used properly