People's Answer: D.
Looking from the assorted weapons to Gira, who apparently just admitted to being a stereotypical teenage pot head (:P), you fire a single shot into his face, causing him to fall back and disappear, as the words
"Not cool bro" echo around the surrounding area. You take the crowbar, strapping it to your back for later use (Somehow), while you lift up the fully loaded gatling gun. Carrying (Barely) the weapon toward the palace, you now think of what to say when you kick in the front door, as we transition this choice game back into Gira's control (If he wants it, that is).
A: Say nothing, only scream incomprehensibly and as loud as possible.
B: Scream "I AM BULLET PROOF".
C: Scream "THIS IS SPARTA"...then get shot for picking an overused meme
D: Shoot the first living thing inside and say "TAG, YOU'RE IT."