题目选项分析

The outspoken abolitionist senator Charles Sumner, after delivering a speech on the senate floor, was accosted by the Southerner Preston Brooks, who, outraged by Sumner's words, bludgeoned the senator with a gutta-percha cane, which Brooks was able to do with impunity, due to a tradition holding that the laws of the United States did not obtain on the senate floor.

The outspoken abolitionist senator Charles Sumner, after delivering a speech on the senate floor, was accosted by the Southerner Preston Brooks, who, outraged by Sumner's words, bludgeoned the senator with a gutta-percha cane, an action Brooks carried out with impunity, owing to a tradition that held that the laws of the United States did not obtain on the senate floor.