Looks awesome, I like B as well, A could work as a cautious, battle-hardened (and a little tired) veteran ready to go into battle, surrounded by enemies but for an action shot - yeah, B seems best. The left arm seems stiff though in the composition shot. Come to think of it, the whole body seems a bit tense, but it might be due to the arm. Maybe she could be aiming at the right monster?
In any case - looking forward to more epicness ^^