The correct answer is A). A thermometer that is used to measure the temperature of the food must be accurate to +/-2°F or +/-1°C and the ones that are measuring air temperature in food-storage must be accurate to +/-3°F or +/-1.5°C. These temperatures are the ones that are the most accurate ones and that is why this is a correct answer.
B, C, and D are incorrect even though they are used, they cannot measure the exact temperature of the food.
