Which of the Following Best Defines 'One Kilocalorie

Which of the following best defines 'one kilocalorie'?

A) 1,000 calories, or the amount of heat required to raise the temperature of 1 g of water by 1°C
B) 10,000 calories, or the amount of heat required to raise the temperature of 1 kg of water by 1°F
C) 1,000 calories, or the amount of heat required to raise the temperature of 1 kg of water by 1°C
D) 1,000 calories, or the amount of heat required to raise the temperature of 100 g of water by 100°C