(I'm sorry)

Well no matter who I save, it will result in no less then 16 of princesses being burned to death, Leading to wars being declared against me from no less then four out of the six armies of Human Men (and/or the Band of Knights), Super Ants, Immortal Skeletons, Almost Invincible Slime Men, Gaint Orcs, And whatever race the Trap Girl is…

(tvtropes links below…)

There is only one correct awnser here.

The one that will allow all 18 princesses to live under my care, In their castle of great wealth fully intact, Ally me with someone of incredible power, to help me fight against the armies who will inevitably declear war against us on account of me choosing to do this, and sleep with a gaint fire breathing lizard girl.

In a nutshell:gimme dragon princess cuz