To find out how many liters of water remain in the pot, you can subtract the amount of water that Henry poured out from the total amount of water in the pot:
Total water = 6310 liters
Water poured out = 315 liters
Remaining water = Total water - Water poured out
Remaining water = 6310 - 315 = 5995 liters
So, the answer is 5995 liters. If the options provided were incorrect in this case, please check the values given or if there's a mistake in the expected answers.