Three important nutritional additions to training for a long distance race are O Protein
O Water
O Increase calories
O All of the answer choices

All of the answer choices would likely be correct. This is just due to the fact that you need to stay hydrated and have protein in your system. The increase of calories would also be nice on account of the burning of them that occurs in a long distance race- therefore, ALL OF THE ANSWER CHOICES, is the correct choice.