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734. The Eastern State Penitentiary was established in 1822 by reformers advocating that prisoners be held in solitary confinement and hard labor so as to reform them.
A. advocating that prisoners be held in solitary confinement and hard labor so as to reform them
B. who were advocating prisoners to be held in solitary confinement and hard labor for their reform
C. advocating solitary confinement and hard labor as the means to reform prisoners
D. who advocated solitary confinement and hard labor for the means of prisoner reform
E. advocating as the means for prisoner reform solitary confinement and hard labor
解析：
A选项没有语义错误
B选项没有时间语义表明这块应该用过去进行时
C选项比A选项简介
D选项没有for the means of这种用法
E选项as位置变换之后修饰的是advocating，语义发生变化
答案：C