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【单选题】
用Q235钢制成的细长压杆，已知横截面形状是宽为6、高h=26的矩形，压杆两端的约束情况为铰支，其长度为L。在给出的以下几种提高其稳定性的措施中(设各种措施下的稳定安全系数相同)，唯有________所取得的载荷值为最大。
A.
将压杆材料改为16锰钢
B.
将压杆下端改为固定端
C.
将压杆横截面改为正方形(保持面积不变)
D.
在压杆中间增设一个铰链支座
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