Of the ones listed, 8:00 AM. But if I had to pick, I'd go with 7:00 AM.
Any earlier than that and I've either stayed up to that hour (in which case, it's less of a bother) or I've gotten up so early that my body is in a state of shock and I get carried on pure adrenaline. Any later and I'm grumpy, but can manage. But 7:00 is just that one sweet spot of misery that my body cannot stand.
Kill 1 man: You are a murderer. Kill 10 men: You are a monster.
Kill 100 men: You are a hero. Kill 10,000 men, you are a conqueror!