Which lines from “nefarious war,” by li po, best express the theme of the poem? a)“oh, nefarious war! i see why arms / were so seldom used by the benign sovereigns.” b)“our three armies are worn and grown old.” c)“last year we fought by the head-stream of the so-kan, / this year we are fighting on the tsung-hoo road.” d)“our three armies are worn and grown old.”