单项选择题
对于岩石的软化性、抗冻性的叙述，正确的是（）。
A.岩石软化系数是岩石饱和状态下的极限抗压强度与天然状态下极限抗压强度的比
B.岩石软化系数越大，岩石的强度和稳定性受水作用的影响也越大
C.岩石抗冻性一般采用岩石在抗冻试验前后抗压强度的降低率表示
D.非抗冻岩石是指其抗压强度降低率大于35%
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