I would go for

1) B - this seems a more balanced force and it would be good to have a few hoplites to fall back on if the lights get into trouble. Also, the way I read it, this gives the most troops - 200 hoplites, 300 marines, 100 peltasts, 125 archers and 75 slingers.
2 and 3) - I am in agreement with makaikhaan - seems good choices to me.