"so the barbarians under xerxes began to draw nigh; and the greeks under leonidas, as they now went forth determined to die, advanced much further than on previous days, until they reached the more open portion of the pass. hitherto they had held their station within the wall and from this had gone forth to fight at the point where the pass was the narrowest. now they joined the battle beyond the defile and carried slaughter among the barbarians, who fell in no one heeded the dying. for the greeks, reckless of their own safety and desperate, since they knew that as the mountain had been crossed their destruction was nigh at "

—herodotus, the histories

this primary source gives an account of the persian wars. the author, herodotus, was biased in favor of the spartans, who died to defend greece from the invading persians. what word gives the reader a clue that herodotus had a bias?
a.
barbarians
b.
greeks
c.
slaughter
d.
reckless